Linear Home Security N/O Wall Mount, Door/Window Transmitter D-21A

Description The Model D-21A Normally Open Wall-mount Transmitter has a normally open input circuit that operates in conjunction with an externally mounted normally open magnetic or mechanical contact. When the external contact closes, the transmitter automatically transmits a two-second digitally coded signal to a companion standard digital receiver. Pressing the test pushbutton on the front of the transmitter will also cause the transmitter to send a signal. Each transmission causes the red LED indicator on the front of the transmitter to light, showing that the transmitter is sending a signal and that the battery is in good condition. General Specifications Encoding Techniques: 8-position DIP switch provided for code setting) RF Carrier Frequency: 303.875 MHz Current Consumption: 12 mA DC transmitting Power: 9 VDC NEDA battery (supplied) Operating Temperature Range: Battery limited Dimensions: 2.4 in W x 4.7 in H x .9 in D (62 x 120 x 23 mm) Features Slimline case design Test/operate switch Test/operate LED 2-second transmission Standard digital format: 256 selectable codes One N/O input loop circuit Loop input screw terminals Powered by one 9-volt battery (included)