... tracker/car gps tracker/gps tracker manufacturer/gsm gps tracker/cheap car gps tracker GSMFrequency channel850MHz/900 MHz /1800MHz /1900MHzGPRSClass 12 ... ,comprehensive through national 3E, explosion-proof, CE, ROHS certified2,Dual built-in antenna design, waterproof ,dustproof anti-corrosion and anti-interference3 ...