GC3 - Glassbreak Detector Batteries
Twist counter-clockwise to remove sensor, battery is CR123A 3-Volt lithium
Pull front cover down, batteries are 2 CR123A 3-Volt lithium
Open door, remove and replace 9-Volt Alkaline battery
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Twist counter-clockwise to remove sensor, battery is CR123A 3-Volt lithium
Pull front cover down, batteries are 2 CR123A 3-Volt lithium
Open door, remove and replace 9-Volt Alkaline battery