The DCIA deters robbery and shoplifting without the high cost of a real surveillance camera. It features a built in motion detector. The "camera" will remain still until someone passes by, then it will move back and forth and a red light will flash. Also an alarm will sound and several pre-recorded verbal warnings are broadcast (verbal warnings are pre-recorded and cannot be changed). This camera can be mounted to either the wall or ceiling. Operates on three "AA" batteries (not included). The camera measures 5 inches x 2 inches x 2 inches (excluding the mounting bracket). The verbal warnings include: "Intruder Alert","Leave the room immediately", "Make no sudden movements","Please touch nothing","Vacate immediately".