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This door switch is triggered each time the door is opened. The sensor sends a wireless radio signal to the STI 34104 chime (up to 1000 feet away) which will chime and flash letting you know the door has been opened. If the supervised transmitter is removed, stolen, loses signal or battery is low, the receiver will produce a single beep once a minute. Sensor uses one 3 volt lithium battery (included), with an average life of 5 years in normal use. The chime receiver uses a 120 VAC input/12VDC output adapter (included).
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