Often it is not possible to capture the beauty of underwater life with normal camera, but thanks to underwater digital camera, now you can explore the marine life. An underwater camera is a special designed digital camera used for still and video photography to capture the amazing flora and fauna of marine life.

You can capture the still images of sea life or can shoot while scuba diving. Safely protected with waterproof casing, these digital cameras are designed to be fully submerged underwater and withstand any surrounding pressure. The smaller models of underwater cameras are normally ideal for up to two hundred feet to four hundred feet while the bigger digital cameras are made for deeper water regions.

As compared to film-based underwater cameras, the underwater digital cameras are much better since they don`t run out of film. Yon can also delete any bad shots or change to a lower resolution picture mode in low-light conditions. No more fuzzy backgrounds and edges as seen in film underwater cameras, with their wide-angle photography, underwater digital cameras delivers sharper images.

Available in all sizes, shapes and film format, many underwater digital cameras also come with viewfinder feature which helps in picture adjustment for photography. With some nice prints, the underground digital camera produces better images which are really helpful for amateur photographers.

However the underwater digital camera is not only meant for deep-sea divers. Many underwater digital cameras available today can also be used to take quality pictures on dry land in harsh climatic conditions like snowfall and severe rains. Adorned with multi-flash function, color correction filter and macro lens, the underwater digital camera offers superb image quality. Just like normal digital camera, this underwater digital camera also comes with 15MB of sufficient memory along with the storage, editing and manipulation software.

If you wonder which model of underwater digital camera to choose, what features to consider, then here is a briefly discussed guide on the features of some prominent underwater digital camera models.

Panasonic SDR-SW20:

This compact model is for those who want an easy-to-use and lightweight underwater digital camera. With 10x optical zoom and MPEG-2 format up to 10 Mbps, this is one of the best digital cameras available for video recording. However, with only 0.3MP 640×480 still imaging capability, the still imaging options are basically non-existent in this new model.

Pentax Optio W30:

One of the pioneers in underwater digital camera market, the current Optio W30 comes with 7MP with ISO1600 and 3x optical zoom image recording feature. Supported by both SD and SDHC, Videos in this underwater digital camera is of 640×480 in MOV QuickTime MJPEG format.

Sanyo Xacti VPC-E1:

This is the one of the best designed underwater digital cameras for up to 5feet depth of water. With 4GB card, and MPEG-4 AVC/H.264 at 640×480 powers, the Xacti E1 allows shooting with an approximate record time of over 5 hours. For still images, this digital camera offers a solid 5x optical zoom with a 6MP CCD at up to ISO1600 power. One special key feature of this underwater digital camera is the flip out view screen which saves you from the risk of bumping in with underwater objects while swimming around.

Olympus SW series:

At 10 Megapixels, ISO1600, and a 3.6x optical zoom feature, Olympus may also be one of the most well rounded underwater digital cameras. With an underwater depth up to 6.6 feet, this is the deepest water digital camera on the list.

Intova IC-700 7.0MP digital camera with underwater housing:

Available in an affordable price of around $300, this underwater digital camera features 7 megapixels, macro mode and an in-built flash that can reach up to five feet underwater.

Here are 9 ways to prevent your laptop from theft as well as an explanation of laptop security devices that ensure your laptop and data are protected. The main attraction of laptops is their portability and mobility. It is great to be able to take your computer with you and use it anywhere. But with these benefits comes a risk of theft. Obviously theft is more likely to happen when an object can be picked up and carried away. Laptop security devices are important to prevent your laptop from being stolen as well as to prevent the data from your laptop being retrieved and used in the event that your laptop is a victim of theft.

9 WAYS TO PREVENT LAPTOP THEFT

1. Don’t use computer bags, while these maybe fashionable and comfortable they make it obvious that you are carrying a laptop. Try using a padded briefcase or suitcase instead.

2. Make sure your laptop is always with you. Do not check laptops in with your luggage while traveling. Never leave your laptop in your car in plain sight or any valuable objects for that matter. There has been a recent increase of car burglaries stemming from people leaving valuables in plain sight. Lock all valuables in the trunk.

3. Never leave access numbers or passwords in your carrying case. Keeping your password with your laptop is like keeping the keys in the car. Without your password or important access numbers it will be more difficult for a thief to access your personal and corporate information.

4. Keep your eye on your laptop. When you go through airport security don’t lose sight of your bag. Hold your bag until the person in front of you has gone through the metal detector. Many bags look alike and yours can easily be lost in the shuffle.

5. Avoid setting your laptop on the floor. Putting your laptop on the floor is an easy way to forget or lose track of it. If you have to set it down, try to place it between your feet or against your leg (so you’re always aware it’s there).

6. Use a screen guard when in public. This prevents people from looking over your shoulder and seeing sensitive information. This is especially helpful when you’re traveling or need to work in a crowded area.

7. Do not leave your laptop unsecured in your hotel room. Things sometimes tend to get “lost” in hotel rooms and are never secure. If you must leave your laptop in the room then use a security cable to attach it to a stable object, such as the desk or bedpost. Another good thing to do is leave the “do not disturb” sign on the door.

8. Make sure that everything that can be labeled is labeled with the name of the individual or organization that owns it, and ensure that these labels are conspicuous. The potential theft value of a laptop or peripheral is reduced greatly when additional work is required to remove the identifying marks. Conspicuous identity labels also significantly increase the risk of a potential thief being caught in the act of theft.

9. Buy a laptop security device. The next section details some options for laptop security devices.

LAPTOP SECURITY DEVICE:

Laptop Cable:

One of the most inexpensive and effective laptop security devices is a cable. Very much like a bicycle lock, this cable attaches to your laptop and allows you to lock it to a stationary object. The cable makes it much more difficult for someone to steal your laptop.

Laptop Tracing Programs:

These programs will report the location of a stolen laptop. They work when the laptop connects to the Internet, and can report the laptop’s exact physical location. Some tracing programs include CyberAngel and ComputracePlus.

Motion Sensors and Alarms:

Unexpected loud noises make people wake up and take notice, something that aspiring thieves find very discouraging. Laptop security companies realize this and have created alarms for portable computers.

While the signaling mechanism of an alarm system is usually the same, the triggering mechanisms are both varied and specialized. There are products available that create a “maximum separation zone” around the user and the laptop. The idea is that if the user moves out of range of the device, or the laptop is moved out of range of the user, the alarm will sound. Thus, if someone tries to steal or remove the laptop, the alarm will sound, drawing attention to the theft.

LAPTOP SECURITY DEVICES THAT PREVENT DATA ACCESS:

Security measures available in order to prevent access to data on your laptop in the event that it is taken.

Set a BIOS password:

Most laptops offer protection by allowing the owner to set a boot password. Typically most will prompt the user three times to enter a password, then refuse to boot if there are three failures.

Set a Login Password:

Set a login name/password that way in order to successfully login in to a laptop, the user must provide that information. If the login entered is incorrect, the operating system will refuse to allow entry.

Encryption:

One of the best laptop security devices are file encryption programs, which, encrypt files on your laptop. A private unlock key is provided to the user, and as long as your private key is kept safe, no one but you and your intended recipients will be able to view your data.

Biometric Fingerprint Readers:

Another great laptop security device is the Biometric Reader. The idea behind biometrics is to use the uniqueness of certain features of a user, such as retinal pattern, fingerprints, and even typing characteristics, to accurately identify and authorize persons. This type of laptop security device would provide a hardware level of authentication that would require authentication before the machine would even boot up.

Every year in this side of the world we face something called as the summer season, a season where the weather becomes erratic, temperatures climb and there are frequent cases of power outages. This is one of the prime times when it is necessary for you to ensure that this weather does not harm your laptop or give rise to any snags. Given below are some helpful tips for using laptop in hot weather: -

Ideal Laptop Temperature

Almost all laptop computers function effectually in the ideal laptop temperature range of 10-95° Celsius or 50-95° Fahrenheit. Don’t forget, if you happen to use the laptop in the outdoors, hot air, it should cool down before it is used in the interior temperature. Likewise, if you are using the laptop indoors, make sure you warm up the laptop according to the temperature outside. Like other electronic appliances, laptops too could develop functional errors due to heat. In these circumstances using a laptop cooling pad, or a laptop cooling mat would help you to easily cool down the laptop whenever it heats up, or needs to be brought to a particular level.

Keeping the Laptop Cool

One of the many warm weather laptop use tips is to utilize an ergonomic laptop stand for dispersing the heat laptop generates. Portable cooling pad and laptop stands, keep you safe from laptop radiation and laptop heat from time to time, but also safeguard the laptop from heat. Using laptop cooling fans would be suggested if you happen to use the laptop indoors for long hours. Laptop cooling fans and certain laptop cooling pads help in stabilizing the heat and stopping it from spreading to your furniture or your legs for that matter.

Pack Your Laptop Wisely

It is suggested that you use well-padded laptop cases, which have been strategically designed to keep the laptop insulated from direct sunlight, heat and moisture. If you plan to buy laptop case or any other laptop accessory like a laptop backpack, or a laptop tote, beach bag, or notebook cooling pad, make sure the accessory is efficient to sustain the heat of the laptop and the outside temperature as well.

Using Laptop Outdoors

Never keep your laptop in direct contact with sunrays, may it be shut down or still in use. If you do plan to use your laptop one glaring sunny afternoon, in the outdoors, you should use a laptop hood for cutting down on the direct sunlight on the laptop screen. Or, you can also use a laptop shield that will act as a bullet proof laptop shield to protect the laptop screen from being damaged due to the harsh sunlight.

Bear in mind that apart from the laptop exterior and laptop screen, the internal laptop parts like the laptop hard drive also stand a chance of developing snags due to exposure to the sun. Using laptop accessories like notebook cooling pad, laptop cooling stand, laptop mat or laptop cooling fans is the ideal way of protecting laptop from heat. You wouldn’t want your laptop to shut down due to over heat. Hence, use Laptop accessories as they are best protection for laptops.

Keeping your laptop safe from online threats requires some preventative and active controls. Follow these general tips to keep your laptop and the valuable data safe and secure.

1. Install Anti-virus Software

Anti-virus software is designed to identify, neutralize and eradicate viruses that can harm your laptop, destroy your data, or exploit vulnerabilities that give spammers and fraudsters access to your accounts and personal data. Choose a good quality, anti-virus program such (Norton Security, Karspersky Security, or Webroot Security. Be careful when you download a program and make sure it is from a reputable site that you trust or go to the manufacturer’s website. To be effective, update the anti-virus software regularly to get the latest virus definitions (best practice is to set it up for automatic updates-this way you will not forget and always will be protected). Most commercial anti-virus programs have the automatic update feature and we recommend that you use it. For your convenience, schedule scans to run when you are not using the laptop, because the resources it takes to run a scan can slow you down your system.

2. Step: Turn on the Firewall

A firewall protects your notebook from Internet traffic entering in or information leaking out. You can use two firewalls (Hardware) and stack them up to increase the security level. Also the level of traffic allowed should be set to “recommended” or HIGH if you so please. There are software firewalls that can be also used such ZoneAlarm and Webroot Firewall, but while anti-virus software scans emails and files, a firewall acts as a guard dog, keeping your system safe from unauthorized entry. It also blocks communications to and from your laptop. To ensure the highest protection, it’s best to use both a firewall and anti-virus/spyware software.

3. Install Anti-spyware Software

Spyware and adware can cause a variety of things like annoying pop-ups and browser crashes, the installation of unexpected toolbars or icons, redirects to inappropriate sites, keys that don’t function, random error messages, browser freezing and sluggish performance. These types of malware are installed on your computer without your consent, and can monitor and in some cases control your laptop. To lower the risk of infection, use anti-spyware and adware software such Norton Security, Karspersky Security or Webroot Security Essentials. We recommend using at least two different programs for broader security and coverage.

Tips for safer surfing the WWW:

• Use a firewall, anti-virus and anti-spyware software and keep it up-to-date
• Keep your operating system, browser and other software up-to-date and patched
• Don’t open email attachments or click on an email link from unknown senders (“Use Common Sense”)
• Scan all email attachments and downloads with anti-virus software
• Don’t download and install programs of unknown origin or innapropriate sites
• Disable Java, JavaScript, and ActiveX if possible
• Scan and Backup critical data often to CD/DVD or External Hard Drive (USB-SATA)
• Perform regular maintenance on your computer like disk cleanup, defragmentation, and system scans
• Create a boot disk in case your computer is damaged or compromised
• Protect your PC-Host file with security essential software or by editing policies correctly.

For more information on laptop Service, laptop repair, Notebook Repair Services, notebook service, laptop Motherboard Repair visit : http://service.ztronics.com

Cellphone usage worldwide numbers in the billions. If there is a possibility of injury from these devices, then a lot of people will be affected.

A cellphone is actually a radio transmitter and receiver. It sends and recieves radio frequency electromagnetic waves. The received signals are fairly low level, so I will concentrate on the signal transmitted from the cellphone.

Cellphones transmit mainly at frequencies of 900, 1800 and 1900 Megahertz (MHz). A microwave oven cooks food using a frequency of 915 MHz or 2450 MHz. In other words, the food is not fussy about what frequency you use, as long as it’s in that range, say 900 to 2500 MHz. Which means, cellphones use Microwave Oven frequencies.

A microwave oven puts out a power of about 1000 watts, on average. If you put your head in a microwave oven, it will take about an hour to cook to a nice sizzling crisp.

A cellphone transmits at a power of about 3 watts, and it self adjusts it’s power continually to compensate for poor signal paths, up to a maximum of 5 to 7 watts. Not much, but there’s a twist…

A microwave oven spreads it’s radiation over the whole oven cavity, so that the food is cooked uniformly.

A cellphone has a tiny, array antenna, measuring maybe 2 or 3 cm in length, and it’s right next to your ear. So 5 watts of power is radiating into your head into an area of perhaps 3cm by 0.75cm. That’s a lot of power when concentrated in such a small area.

The cellphone manufacturers have said that they have put “shields” into their phones to keep radiation risks to a minimum.

If you turn around while making a call, does the call cut out or the audio disappear at any time? No, it doesn’t. Radio waves, like light waves, travel in a straight line. If your head got in between the cellphone and the cell transmitter tower, then the signal should be blocked (shielded) by the shield in the phone, as the waves can’t bend once they’ve left the phone.

Which means that those microwaves are going through your head, all the time.

Whenever you’re “on the phone,” you are being microwaved just like the roast in your microwave oven.

So What Can You Do?

If you’ve got a handsfree kit, use it if it’s practical. Don’t use bluetooth – it also transmits radiowaves close to your head, albeit at different frequencies.

If your phone has a loudspeaker, switch it on and speak at a distance. The guy on the other side will still hear you perfectly.

Buy phones with a low Specific Absorption Rate (SAR)

Don’t let children make long calls. Their soft skuls are much more affected than the hard heads of adults. (See “The Stewart Report.”)

Swop ears every minute or so, to give your head time to “cool down” on that side.

Don’t hold the phone next to your ear while connecting – this is when it transmits at maximum power.

Avoid making calls in weak reception areas, as the cellphone will boost it’s output power to make sure it stays connected.

Keep your conversations short.

Use SMS’s whenever possible.

Avoid sleeping with a cellphone under your pillow. Cellphones transmit even when you are not using them, exchanging data and checking signal strength, at regular intervals.

Avoid carrying the cellphone close to your body. This applies especially to the breast pocket of people with heart problems.

Use a landline whenever possible.

Many people have proven health problems from cellphone usage, brain tumors being the most common, followed by loss of memory, impaired brain function and other symptons. Usually these symptons take a few years to surface.

By taking the simple precautions listed above, we can actually save our lives. Tell your friends too. There’s a lot of people out there that need to know these facts.

You can thank me later!

 

Battery Conservation Tips

Are you always running out of battery power just before you take that perfect picture with your digital camera? Here are some

tips to conserve your batteries when you are out “snapping away”.

1) Turn off your digital camera when not in use. If you are in a situation where you must snap pictures quickly, this may not

apply as turning digital cameras on and off take a few seconds, and may cause you to miss a picture-taking opportunity.

However, if you are taking a leisurely stroll and can afford a couple of seconds before snapping a still subject, by all

means, conserve your digital camera’s energy!

2) Many digital cameras have a regular viewfinder and an LCD viewfinder. While the digital LCD viewfinder has its benefits,

it can drain battery power. Turn it off when applicable and use your regular viewfinder for taking pictures.

3) Don’t stop after taking every photo and look at the picture in your digital camera’s playback mode. Granted, you sometimes

need to look at photos immediately after shooting them in order to make sure your exposure is correct, the lighting is ok,

etc., but doing this does use up your digital camera’s battery power.

4) If you are using MicroDrive media, be forewarned that these miniature hard drives may take up quite more power than

Compact Flash cards.

Taking care of you new battery pack

Normally, a new battery pack comes in a very low charge condition and must be fully charged before use. Refer to the user

manual of your portable electronic equipment for charging instructions. A new battery pack needs to be fully charged and

fully discharged or “cycled” as much as five times to condition them into performing at full capacity. Your equipment may

report a fully charge condition in as short as 10 to 15 minutes when the new battery pack is being charged for the first

time. This is a normal phenomenon especially for Nickel Cadmium (Ni-Cd) and Nickel Metal Hydride (Ni-MH) chemistries. When

this happens, remove the battery pack and let it cool

down for about fifteen minutes then repeat the charging procedure. “Conditioning” (fully discharging and then fully charging)

is necessary so as to maintain the optimum performance of a battery pack, and is recommended at least once a month

particularly for Ni-Cd and Ni-MH batteries. Failure to do so could result in reduced charge capacity and can significantly

shorten the battery packs useful life. Lithium Ion batteries do not require conditioning. It is normal for a battery pack to

get warm when charging and during use. However, if the battery pack gets excessive hot, here may be a problem with the

portable electronic equipments charging circuit and should therefore be checked by a qualified technician. Rechargeable

batteries undergo self-discharging when left unused for long periods of time. This is normal particularly in the case of Ni-

MH and Li-ion chemistries. For best results, always store a battery pack fully charged. It should be removed from the

equipment and kept in a cool, dry and clean place. The amount of runtime a battery pack produces depends on the power

requirements of components in your electronic equipment.

Don’t let under-charged batteries keep you from taking great photos.

If you infrequently use your digital camera, you may think that you after you use your digital camera, recharge your NiMH

batteries, wait a few weeks or months, then use your digital camera again, that your batteries will be charged and you’ll be

ready to snap photos, right?

Oops… Do that and you’ll be stuck with a non-functioning digital camera or one that just blinks a picture showing a dead

battery.

Rechargeable batteries don’t stay charged forever. They tend to lose a little bit of their power every day. If you charge

your batteries and frequently use your digital camera, you will probably never notice this loss of power. However, after a

couple of weeks, the power loss may be noticeable, and after a couple of months or longer of non-use, those once ready-to-go

batteries may have lost enough power to make them unusable.

Don’t get caught in this trap. Always charge your batteries before every trip, and make sure to use a battery charger with a sensor that prevents over-charge.

more info: http://www.camera-battery.org

Cellphones, for all practical purposes, have become a necessity in the modern world. Not only are they used as a communication device, they are now increasingly seen as a personal computer system with functionalities that were previously associated with the bulky desktop. Powerful as they may be, modern cellphones are limited by the fact that they rely on the batteries which do not hold a large amount of charge. Thus, in this article we will examine ways in which cellphone users can extend their cellphone’s battery life.

Turn Off The Vibrate Feature

One of the best techniques to increasing the battery life of a cellphone is by turning off the vibration mode ringer option. This is one most energy draining feature found in today’s cellphone, the energy required for turning the tiny motor which causes the phone to vibrate is almost double to that required for the same phone to ring.

Turn Off Back Light

Most people generally use their cellphones in areas with sufficient background light, hence in these places there is no real need to have the back light on. However, if you do require to use the back light then its best to keep your back light time out to no more than 3 seconds.

Use Cellphone Just For Talking

If you want to conserve your battery then its best to use the cellphone for what it was initially intended for and nothing else. This means that you should avoid playing games, using the built in camera feature, listening to music, instant messaging or surfing the web. Battery use is directly related to cpu use, so the more tasks you do with your cellphone the faster your battery will drain.

Reduce Volume Level

Another way to increase your cellphones batteries is by lowering down the volume for the ring tone and by turning of unnecessary sounds such as the button pressing clicks and key tones.

Turn Off Your Cellphone When Necessary

It is pointless to keep your cellphones on in situations that you know you will not be able to get a signal at such as on a plane, subway or in a library. Scared of missing a call, don’t. Many cellphone providers already have a system in place that would avoid you from missing a call. In this system, if a caller is not able to reach you then they are automatically forwarded to your voice mailbox where they can leave a voice mail for you to review later on.

Take Care Of Your Cellphones Battery

Battery are not very resistant to temperature changes, hence its vital you store your cellphone batteries in a place that is at room temperature and away from direct sunlight. If possible try to fully charge your batteries nightly at minimal once every three days. Over time the terminals on the battery may become oxidized, depending on the severity you may just need to clean the terminals with alcohol or need throw the battery altogether.

Over time cellphone batteries do begin to lose their charge capacity. This is due the general wear and tear and is to be expected. On average you can expect a modern cellphone battery to last for a couple of years before needing replacement.