... real-time Parameter GSMFrequency channel850MHz/900 MHz /1800MHz /1900MHzGPRSClass 12,TCP/IP build in GSM MODULEGPS sensitivity-159dBmGPS positioning accuracy ... than 25 MaLEDLED light indicates that the GPS,GSM,etc working conditions andOther circumstances main Features1.OBD ... through national 3C, explosion-proof, CE, ROHS certified2.Dual built-in antenna design, waterproof ,dustproof anti-corrosion and ...