Control command input from an external device or door, window 
 Safe  Range Remote Digital Control System 1 Channel TRANSMITTER

Up to 700 Feet of Line-of-Sight Range     Complete RF Supervision  Accept N/O  or  N/C contact input  Alarm, Supervisory, and Low Battery Transmissions  Includes external magnets  Lithium Batteries (included)

SPECIFICATIONS  Dimensions: 3.3 in L x 1.6 in W x 0.8 in H (84 x 40 x 22 mm)  Power: Two 3V DL-2032 lithium batteries (supplied)  Current Consumption: Standby -- 1 mA; Alarm -- 8 mA average while transmitting  Battery Life: Five years typical  Measured Range: 700 feet minimum, open air   Number of Channels: 1 channel - top or front  Operating Frequency: 315 MHz    Compatible Receivers:  936004   936008   936002