Wireless PC Security Lock - Office & School

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Computer security is a growing area of concern. Your information is private so you want to keep it secure even in your absence.This device works by detecting if the user is present at their desk. When he/she leaves the computer goes into "lock mode". When the person returns within a 2 metre range a password prompt appears and if entered correctly the computer unlocks and continues in full operation.Even if someone removes the dongle, a password will be required to disable the device. Features:Effective range: around 2 meters Operation frequencies: 434MHz (CE) Transmitter Power Supply: DC 3V Battery usage: approximately 2000 hours Receiver Power Supply: DC 5V – provided by the computer through the USB port Software Driver: supports Windows 98SE/ME/2000/XP Computer automatically enters “Lock Mode” when the user is away from computer by more than an effective range The computer automatically resumes operation when the user is back to within an effective range Once the computer enters the “Lock Mode', a password is required to use the computer if the transmitter/receiver pair is not available to unlock the computer

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Bushnell Sonic Night Vision Scope - For a long time, man has had a fascination with being able to see at night without the use of big blinding lights. Until recently this has been nothing more than a dream, but this dream is now reality, with Bushnell Night Vision Scopes. The scopes are perfect for wildlife observation, home security, night time walking - in fact anything where you need to see in the veil of darkness. Bushnell Nigh vision scopes comprise of high-quality image intensifier tubes and optics that amplify existing light allowing you to see in conditions too dark for the naked eye. All of the Bushnell models feature an infrared illuminator for vision in total darkness, so stop guessing what's out there, and discoverer the night with Bushnell Night Vision.So how does night vision work? Well, in layman's terms it is fairly simple. You look through the one end when it's dark, and 'voilà!', you can see through the other end. However, for those more technically minded the answer is as follows: Available light (energy) is collected is /by the objective lens and focused on the image intensifier. Inside the intensifier a photocathode is "excited" by the light and converts the energy into electrons. The electrons accelerate across an electrostatic field inside the intensifier and strike a phosphor screen (like a monochrome tv screen) which emits an image that you can see. This acceleration of electrons provides gain and enhances the image. The aptly named Bushnell Sonic Night Vision Scope features a highly sensitive audio boom microphone which will detect sounds up to 82 meters away. It also comes with headphones and a recording port, so you'll see and hear exactly what you are looking at. It is extremely lightweight and compact and can be used for night time viewing of over 180 metres. Technical Specification. Magnification: 2.5 x 42. Viewing Range: 1.2 - 183 metres. Field of view: 26 m @ 100m Infrared illuminator: yes (built in). Battery type: AA (2) not included. Dimensions: Size: 170mm x 95mm x 70mm Weight: 397 grams Tripod Mount: Yes. This can be used with a tripod. The Bushnell Sonic Night Vision Scope is the ultimate in stealth and provides a quality that no flash light can ever claim.

Giant Bubble Machine - Making big bubbles is more scientific than you could ever imagine.It involves all of the laws of saponic bonding (that's soap to you and me) the ingenious invention of a mad American scientist (the giant bubble machine) and lots of practice.You'll be glad to know however that you do not need to be a Master of any of the modern science disciplines to master the art which is creating giant bubbles.Instead all you need to do is follow the in depth (and amusing) guide book, that accompanies the kit. This guides you through the art of bubble making, and even provides a trouble shooting kit at the back for those (like me) who struggle.Once you get the hang of it, this really is great fun. This can be greatly accentuated if - as the book suggests is possible - you can create a bubble on a cold day that will literally turn to ice and float for miles shattering into 1000's of pieces on impact. Great!

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