The products is wall mounted compound gas&carbon monoxide detector with high stability(hereinafter called detector).It is used for detecting leaking gas,carbon monoxide.Advanced semiconductor sensor is adopted to ensure high stability and long life.It is convenient for mounting.Build-in MCU connected to I/O of all kinds of functional modules,with its program written in the MCU to coordinate all the modules work properly,stable and reliable.The products is suitable for the safety of residential house,villas,hotels,market,boarding house etc.