Before buy,please check There is no difference between 2G TK905 and 4G TK905 in appearance function,and quality. Their difference is only in the network. The 3G TK905 supports 3G networks, and the 2G TK905 is only compatible with 2G networks. USA, Australia, New Zealand, Korea, Japan, Canada, Singapore, Taiwan;Customers in these countries, please choose the g version. Your country has closed the 2g network.Customers in other countries, you can choose at will. Please note that the car charger is priced at 15$. If you just place an order for a Car charger, there is no GPS function. 4G TK905 GPS Tracker LTE Specification Operating bandLTE Cat-M1/NB2: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B26/B28/B66 Data transmissionLTE Cat M1: Max. 588kbps (DL), Max. 1.119Mbps (UL) LTE Cat NB2: Max. 127kbps (DL), Max. 158.5kbps (UL) EGPRS: Max. 296kbps (DL), Max. 236.8kbps(UL) GPS Specification GPS chipsetMTK high sensitivity chip FrequencyL1,1575.42MHz C/A code GPS channel66 Location accuracy<10 meters Tracking sensitivity -165dBm Acquisition sensitivity-148dBm TTFF (open sky)Avg. hot start1sec Avg. cold start40sec Interfaces Cellular antennaInternal only GNSS antennaInternal patch antenna LED indicatorsCEL,PWR Micro USB interfaceUsed for charging and debugging Others Battery5000 mAh, 3.7V Li-Polymer battery Operating temperature20 to +70 Device dimension 90 X 72X 22 mm Device weight168g Operating voltage4.5V-5.5V DC