CO Safety and Flammable Gas Detector with Gas density monitor LCD display with Solenoid Valve. Home, Commercial, Car where Natural Gas, LPG gas, Coal gas used for heating, cooking are suggested to install CO Alarm. Avoid Fire and harmful gas danger with CO and Gas Density and Gas Species indication, loud sound 85dB sound and Light Alarm Safety. It auto drives solenoid valve and exhaust fan to shut off gas tube. Residential Security and Commercial Security CO and Gas Alarm Detection System.