Detailed Product Description CO alarm SCM03:Battery operated Carbon Monoxide Alarm can prevent you fromHarm of gas leakage. It uses the ... ~50C; 20~95%R.H. 11standard:Electrochemistry CO alarm only use to detect CO gas.CO gas is one poisonous gas,without color,without ... heater.So to be safty,we suggest you to install CO alarm in kitchen,wash room,dinning room,bedroom,,garage etc.When ...