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.
|Power||One 9-volt battery (included)|
|Dimensions||2.4" W x 4.7" H x .9" D (62 x 120 x 23 mm)|
|Encoding Technique||8-position DIP switch provided for code setting|
|RF Carrier Frequency||303.875 MHz|
|Current Consumption||12 mA DC transmitting|
|Operating Temperature||Battery limited|