 Model: AK-228A3/A4  Warning temperature: 60°C/70°C/80°C  Working voltage: 9VDC  Working current: static current<30ua, alarm current<30ma  RH: 10%~95%  Alarm volume: 85dB at 10 feet  Alarm output: sound and light alarm/NO,NC/ wireless output: 433MHZ/315MHZ  Installation height: blow 4m  Additional function: link exhaust fan  Patent NO.: 200830104027.0 200630104026.6