Technical parameters: Working voltage: AC230V50~60HZ Power dissipation: Less than 3W Use environment: Temperature: -10o C~50o C. Humidity: Less than 95% Alarm consistency: Gas ≤25%LEL Alarm voice: More than 85dB Product performance feature: This alarm is suitable for inspecting leakage of household gas. It is sensitive to liquefied gas, natural gas and coal gas used in cities, is convenient to install, simple operation, safe and reliable, economic and applied. When the gas consistency reaches alarm value, the alarm will send out alarm signal of sound and light, to remind you taking proper measures in time to avoid blast and poisoning. Operation: Put through electricity to preheat, yellow and green lights are bright, and the preheating time is less than 2 minutes, the alarm will not check gas when warming up, after preheating, yellow light is extinct, and the green is still bright, then enter inspection state, and when alarming, the green light will die, red light will shine. (note: Red light and green light are double-colour tube) button is for testing, alarm when pressing the button, and stop alarming when loosening it. Packing: Blister, 38x29x23CM/CTN, 12pieces/CTN, 3.5/3.0KGS/CTN.