A wireless hidden camera will have the 2.4 Ghz video transmitter built inside the unit as well as the camera. The unit must be plugged into the wall for power. The included receiver will receive the wireless transmission. The receiver must be connected to your TV or DVR in order to view or record. If you wish to view your camera over the Internet live or if you wish to use your computer at all, then you will require additional hardware (either a Standalone DVR or a DVR card).