What are wireless spy cameras?

What are wireless cameras are basically described as a wireless transmitter carrying a camera signal. The Camera is wireless and the signal travels between the camera and the receiver. This works much like radio. The sound you hear on a radio is wireless and you tune to a certain frequency and hear the sound. Wireless cameras have a channel also. The receiver has channels to tune in and then you get the picture. The wireless camera picture is sent by the transmitter the receiver collects this signal and out puts it to your TV and / or VCR..