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. If you need to use a laptop or PC to record you will need the usb receiver version of the wireless cameras click here for these