1.QM-Q3 Type Gas Sensor uses SnO2 material as impressible material. SnO2 material is most advanced in the world at present, and being usually in cosmicall production. When being in hydrogen gas, the ele-conductance is on the increase with increasing gas chroma. 2.BT-K200 gas alarm device The core component of BT-K200 is Nanometer SnO2 gas sensitive sensor, which the High-Tech newest achievement in the tenth Five-Year Plan ?The sensor has high gas sensitivity, good stability, long-lived useful life. 3.SSM-002 Rain-Dropping Sensor This sensor was made of special electrical Thick Liquid Material and advanced Thick-Membrane Technology. Main applications: Preventing from the soak when needs to control automatically in the engine room which was nobody on duty, the door and the window of the hotel, saloon car, passenger car, or any other yards etc. 4.QM-NG1 Gas sensor This Type Gas Sensor uses SnO2 material as impressible material. SnO2 material is most advanced in the world at present, and being usually in cosmicall production. The characteristic of the product is with High sensitivity for all flammable and poisonous gas, Long inductive time, Long resumptive time, and Long life-span ect.