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B309M Slide Switch Door/Window Area Alarm
Features:
â—†Emission 130dB piercing alarm when a door/window is opened
â—†Slide switch for Delay/Chime/Off setting
â—†15sec. Exit/Entry delay facility
â—†Low battery LED indicator
â—†10mm operating gap
â—†4x1.5V alkaline AAA type (not supplied)
 

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