Wireless spy cameras work by sending a video and audio signal between the camera and a receiver. The receiver can then be connected to a TV or video recording device. although the range is limited by legal restrictions they can still be a verey effective covert camera surveillance system. All the camera systems we sell come complete with receiver that can be plugged into a TV or recorder through the AV sockets or through a SCART Socket. Some of the cameras can also be supplied with a USB option this enables the receiver to be pluged into the USB port of a PC. The software for this is supplied with the receiver and when installed allows you to view and record with your PC.