A lot of companies nowadays installed a key logger in their employees computer as a security; or if you are worried about your children, siblings are doing in your computer, then you can track them. Of course, this is good only as long as you are no more than 8 feet away from your subject, since that is as far as the nightvision range works (including audio) in complete darkness. Hidden Camera – which are divided such as the office spy cams, home spy cam, wireless co lour spy cam, spy cam video, real spy cam, spy camera systems. Cheap spy cameras are often used for surveillance and security, but they also have some other uses as well. Since the hidden camera has wireless capability, it can be installed in any place and it would pick up the video and send it to the receiver. The camera can be virtually placed in a clock, speaker, light bulb, air freshener etc. and can capture clear picture and transmit within a specific distance from the receiver. It will not have any visible wires that might lead a suspicion to the people. This computer tracker device is especially designed to be untraceable so your children are not going to find out that someone just stole their data in their computer.