DHI-HY-HT5MB
Mains Powered Heat Alarm with 9V 1-year Replaceable Battery Backup
> Operating Voltage: AC 100V - 250V, 50/60Hz
> Back-up Battery: Replaceable 9V alkaline
> Battery Life: about 1 years
> Sensor type: Thermistor
> Standard: BS 5446-2:2003