Emergency Light has a mini camera hidden within. By pluging the Emergency Light into an electrical outlet or by using the included power adapter makes the unit operable & immediately begins transmission to the Receiver Unit. The Mountain red switch) for the channel selector is located in the rear. If using more than 1 transmitter, additional units must be assigned to unique channels (2, 3 or 4). In order to obtain the best reception, the antenna should be angled in the direction of the receiver unit when possible. The signal radiates forward from the front of the emergency light. Do not place anything in front of the Emergency light as this may cause distortion or break up in transmission.