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Features: high performance sensor powered by 2 x small 23A 12v Batteries, large LED at front of sensor for easy to read operation, attaches to almost any door or window, the tiny magnetic strip makes it suitable to attach to almost any type of door or window frame, sensor can be attached by tape or screws, low battery LED indicator, transmitting distance up to 300 metres in open space and 100 metres through walls, Battery life 1 - 2 years
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