Power: AC110~240V/50Hz，60Hz ·Mounting: Accessories supplied for wall mounting. ·Alarm volume : ≥85db(A) at 1m ·CO alarm pattern: BI 0.5s--pause 0.5s, with corresponding red LED flash. repeat this pattern ·Self-detection function ·Operating Temperature : 0℃ ~ 50℃ ·Ambient Humidity : 10%~ 90% RH ·Sensor : semiconductor CO sensor ·Test/Reset Button ·Power Consumption : ≤4 W ·Type of gas be detected : Carbon monoxide ·Alarm sensitivity: 100±50ppm ·Quomodo of power supply input:AC power input line