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"AV voltage: AC 90V-240V 50-60Hz Battery voltage: 9V rechargeable battery (optional) Working temperature: 0°C-50°C Warm-up time: about 180S Environment: 10%-95% Sound level: 85dB / m Alarm density: 2500PPM (±1500PPM) Size: 112 Ã? 73 Ã? 42MM"