Bosch Wireless Radion Breakglass, RFGBBattery Life: Up to 5 years using one user replaceable CR123A Lithium battery. Coverage Range: Maximum radius of 6 m (20 ft) from the glass being protected. Glass Types: Detects breaking of plate, tempered, laminated, and wired glass up to 6. 4 mm (1 4 in) thick. False Alarm Immunity: It uses "Dual frequency" technologyit must hear the low frequency "thud" (flex wave) of an impact followed immediately by the high frequency "shatter" to trigger an
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