Ion smoke detector sensor: England CIC-AEA chamber 
Operating voltage: DC 9V
Working current: DC 12V, 24V
Standby current: less than 10uA
Alarm current: 10mA-20M
Operating temperature: -5 to +60 degree Celsius
Working humidity: less than 95%RH 
Alarm mode: sound and flash alarm
Alarm volume: 85dB/(10 feet)   
Sensitivity: adapt to U1217 standard, 3.2% weak  smoke per feet the detector respond
Alarm output: sound and flash alarm, auto reset after alarm (wired), alarm transmitting
F: 315M/433M
Transmitting distance: 50m (with block) (optional) (wireless)    
Dimension: dia10.89cm
Thick: 3.96cm