How long do the batteries last on average?

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How long do the batteries last on average?

How long do the batteries last on average?

Depending on frequency of activation, the average lifespan is about five years. The iSeries PIR detectors use CR123 lithium batteries, while the TFRi and QFRi Photobeams use two LSH20 D-cell lithium batteries in the transmitter and two in the receiver.