"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"