Smoke alarm,Gas alarm,Carbon monoxide alarm(3 in 1) - CE,CCC,ISO9000 certificated - High quality with best price - Hot seller Smoke alarm, Gas alarm, Carbon monoxide alarm(3 ... .Power consume: ≤2W3.Alarm sound: ≥100dB4.Respond time: 10seconds5.Comeback time: 30seconds6.Test density: Liquefied natural gas 3000PPM, City coal gas 800PPM, Carbon monoxide ...