Wireless Hidden Spy Camera Use a radio transmitter to send the video signal from the camera to a receiver that hung next to the device. The camera and transmitter are inside the book. This system id fully concealed. The camera is very easy to operate. Just plug and play.The main advantage of the wireless hidden camera is a simple implementation. With a conventional camera system wired, cable management can be more than the price of the unit responsible. In addition, these cameras are are also in the position where it could be quite difficult to set. Wireless Hidden Spy Cameras are ideal for real time monitoring and surveillance. Note:This book need to connect to a power supply through the cable installed.