T8124: data logger gps tracker,could work without SIM card

T8124 is a data logger gps tracker,it could work still even without SIM card,just need insert the SD card,it will receive data to the SD card. Of course,if you insert SIM card,it will work as a gps tracker still. Could swtich gps data logger and gps tracker easilly.

Main features:
1.Never lost data, Always online(Switch between two working mode: GPS tracker or GPS data logger)
2.Build-in MicroSD card and support up to 32G byte data
3.Water-Proof Design, 2 input voltage:12-24V or 48-80V
4.Build-in 500mAh Li polymer backup battery