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Technical Specifications Power supply: 10-year sealed lithium battery Sensor type: Photoelectric Product life: About 10 years Safety standard: UL 217 Smoke sensitivity: 0.97-1.79%/ft OBS Standby current: < 6 µA (avg.) Alarm current: < 60 mA (avg.) Best operating ambient temperature: 40-100 °F (4.4-37.8 °C) Operating relative humidity: < 85% (non-condensing) Alarm noise level: ≥ 85 dB at 9.84 ft (3 m) @ 3.2 ± 0.3 kHz pulsing alarm Alarm silence: ≤ 9 minutes Product Size Alarm Unit Diameter: 5.0 in (127 mm) Thickness: 1.9 in (48.3 mm) Weight: 0.56 lbs (254 g) Mounting Bracket Diameter: 5.7 in (146 mm) Thickness: 0.08 in (2 mm) Weight: 0.11 lbs (50 g) Package Contents 1 × Alarm Unit 1 × Mounting Bracket 3 × Screws 3 × Anchor Plugs 1 × User Manual 1 × Warranty Card