Battery Type: 3 Volt Lithium; Panasonic CR123A. Battery Life: 12 Months Minimum Battery Replacement: Upon Low battery report and/or during annual maintenance. Average Standby Current: 32.8ua Average Alarm Current: 35ma Tamper Switch: On base Sounder: 85db at 10' temporal 4 pattern. Reset: Automatic Sensitivity: Listed to UL-2075 Evaluated to UL-2034 Low battery threshold: 2.7V Operating Temperature Range: 32F to +100F. Operating Humidity Range 15% to 95% RH. Maximum Operating Altitude 6000ft. above sea level Testing: Follow this manual and NFPA 720 or local requirements. Transmission: In compliance with FCC part 15 for reception on equipment manufactured by Tyco Fire & Security GmbH Test Transmission: Every 90 seconds Mounting base diameter 5.30''� Weight 7.0 oz. without battery