This product is a smart residential gas detector, using high quality gas sensitive element, to detect gas leakage such as natural gas and liquefied petroleum with high reliability. With RF communication with smart gateway PTG10(sold separately), it can remotely alarm and control the local system of gas leak alarm and linkage output with solenoid valve. It is widely used in home, hotel, apartments and other places, effectively avoiding fire and explosion accidents because of gas leak. This product design, manufacture and verification comply with the following national standards: GB 15322.2-2003 Independent Type Combustible Gas Detector with Measurement Range of 0~100%LEL