This product is gas detector which has high stability of combustible gas (hereinafter referred to as the detector), for leak detection of combustible gas. The detector adopts the most advanced semiconductor gas sensitive element,. It has the features of stable operation, long service lifeand easy installation. The detector is processing with built-in MCU central control, each function module is connected with MCU I/O port line directly or indirectly, it can complete the normal work of the detector of each functional module by curing the program of MCU.So the probe can be more stable, safe and reliable. This product is suitable for residential areas, villas, hotels, apartment family property such as the existence of combustible gas place, it can monitor safety.