Technical specification: GSM: 900/1800MHz or 850/1900MHz GPRS: Class12,TCP/IP Voltage range: 9-48VDC(can also connect 12/24V) Standby current: ≈0.2mA Operating ambient temperature: -20°C - +70°C Work environment Humidity: 20%-80%RH Dimensions: about 55.0(L)x40.0(W)x15(H)mm Installation method: Check the product, open the package and check product model and accessories. If there is something wrong or missing, please contact the distributor. SIM card choice, terminal needs to insert a GSM SIM card. SIM card installation, use your hand to uncover the terminal cover, uncover SIM card slot cover, the SIM card metal side down and put the card into the SIM card slot, then fasten card slot cover, and finally put on the back shell. Terminal chosen & installation This device is high technical GPS product, please choose the professional organization or person that distributor designated to install and debug.Please follow the following order to do terminal installation, don"t inverse. In the installation process, please don"t give terminal power supply. The terminal"s installation suggests to be a concealed installation. It is suggested to let the professional organization that dealer designated do the concealed installation, please pay attention to the following items: 1) to avoid the thieves" destruction, the terminal should be hidden as far as possible, please notice waterproof; 2) avoid to put it together with emission source, such as burglar alarm and other vehicle communication terminal; Package included 1 x GPS tracker 1 x 3P wire 1 x Chinese user manual 1 x English user manual