Shenzhen Changlongsheng Mach. & Technique Co., Ltd. was set up in 2000. Our company is located in Nanyou No.1 Industrials Area in Nanshan District, Shenzhen City. Now our company has an area of 1000 square meters. We have more than 120 employees, including more than 20 R&D employees and 10 senior industrial engineers. Our products include outside heaters, potentiometers, guiding lights boards, and bucket frames. Our band heaters have reached the amount of 1 million pieces. The annual output of electrical temperature sensors (ETS) is one hundred thousand, the output of potentiometers is more than two hundred thousand and the output of store water bottle frame is mort than 10,000 sets. (1) The series products of band heaters have obtained the following certificates: 1. SGS-CE certificate, the certificate no.:"GLES0031200483HS". 2. CSA, CUS, certificate No: "223883"; 3. Gotten national