Based on GSM / GPRS and GPS system; Can locate and monitor distant object; Waterproof grade: IPX-6; Built-in li-ion battery, long standby time; Charging time is 3~5h; Widely used in car renting, small vehicle group management, outdoor sports, monitor kids, old people, disabled, pet and valuables, personal safety, tracking and locating, etc.; With functions of locating, monitoring, electronic fence, moving alarm, beyond speed alarm, vibration alarm, SOS, emergency help while in speaking, low battery alarm, sleep mode; Instruction: confirm, make sure there is SIM card, with function of talking, SMS and GPRS and enough money, make sure there is incoming call display and incoming call transfer is closed; Charge for more than 12 hours for the first time use; Clean it with dry cloth; Do not disassemble the device; Use original battery and charger