China Smoke Gas Alarm Detector manufacturers Smoke gas detector GDN-YW1 What is the smoke gas detector used for: Smoke alarms detect fires by sensing small particles in the air using a couple of different kinds of technologies. Once they detect those particles above a certain threshold, they signal the alarm to sound so that you and your family can get to safety and call the fireman. Smoke alarms save lives. Technical data 1.Unit Size:桅140X41mm 2.Working Current: 1-Static Current: 鈮?0渭A 2-Alarm Current: 鈮?2mA 3.Operation Voltage: DC 9V Battery 4.Alarm Sound: 鈮?5dB(3m) 5.Ambient Temperature: -10掳C-+60掳C 6.Ambient Humidity: 鈮?5%RH 7.Sensor: Optical 8. Low Battery Alert Remain: 7-15 days 9.Certificate:EN14604 CE RoHS ApprovalChina Smoke Gas Alarm Detector manufacturers website:http://www.hngoldenltd.com/home-gas-detector/smoke-gas-alarm-detector/