This door announcing device bounces a continuous, invisible infrared beam to the reflector and routes it back to the receiver. When this beam is broken by a customer or an intruder it will announce the violation by either a pleasant chime or an attention getting alarm (switch selectable). This reflective technology works in daylight or complete darkness and eliminates the need for a separate transmitter and receiver. An alignment LED is provided for fast and easy installation. The maximum detection range is 35 feet. Two chimes may be hooked up if required. (An extra chime may be orderd at $49 P/N MF020) UL listed. A 35 foot length of AWG #22 wire is provided. A 6VDC power adapter included. MF019