http://www.chuango.com/english/contentpro.asp?ModuleType=3&ChannelID=3&classid=26&id=86
Specifications
Power Supply AC 110V ~ 220V
Maximum Siren Volume 90dB
Backup Battery 3.7V 600mAh rechargeable
lithium battery, 2.22Wh
Alarm Current < 100mA
Static Current < 13mA
Radio Frequency 315MHz or 433.92MHz (±75KHz)
Housing Material PC+ABS plastic
Operation Condition Temperature: 0°C ~ +55°C
Relative Humidity: < 80% (Non-condensing)
Dimensions (L×W×H) 90×90×42.2mm (Not include the plug part)