Model : GPS108A , 108B Difference between 108A/B model : 108A is portable type . 108B has relay & cables ,can cut off enginne & connecting to vehicle power . Technical features: DIM.106x63x37.5mm Weight : 343g Network : 2G GSM/GPRS GPS sensitivity : -165dbm GPS Accuracy: 5m Time to first fix : Cold starts: 30s Aided starts: 5s Reacquisition: 1s Charger voltage : 110－220V input , 5v output Battery : Chargeable 3.7V 10000mAh Li-ion battery Waterproof grade : IP66 highlights : 1. IP66 waterproof 2. Strong magnetic 3. Portable, no wiring , easy installation 4. Built-in 10000MA battery 5. Real-time tracking by SMS / IOS Android App / Platform 6. long standby,6 months if it works under “sleep by time” mode and 6.9 years if it works under “schedule” mode 7. Anti-tamper alarm,Movement alarm, Geo-fence alarm, shock alarm 8. Voice listen-in by microphone 9. Multiple sleep mode 4 tracking solutions: - SMS tracking by calling, return google map link - Absolute street address by SMS - Free mobile app Trackerhome - Free tracking platform GPS108A include : Gps unit, usb cable ,user manual ,box GPS108B include : GPS unit ,usb cable ,harness cable,relay , user manual ,box