GPS basic functions

　　1. Single positioning: Know the exact location anytime, anywhere

　　2. Automatic continuous positioning: send a latitude and longitude information every 30 seconds

　　3. Hidden number positioning: When a number displayed by a hidden number dials the device, the device will send a latitude and longitude information to each authorized number

　　4. The user can hear the sound near the device after dialing the device

　　5. Electronic fence: The working range of the equipment can be limited. Once the equipment runs beyond the set range, the equipment will immediately alarm

　　6. Shift alarm: The equipment stays in one place stably for a certain period of time. If it exceeds this place, it will immediately alarm or give an overspeed alarm. When the running speed of the equipment exceeds the set speed, it will immediately alarm.

　　7. Emergency alarm: one-key alarm, press and hold the one-key and press the alarm key for 3 seconds, it will alarm immediately

　　8. Bottom power alarm: when the voltage of the device is close to 3.7V, it will alarm

　　9. Ultra-small size: 60*45*15mm, normal work 48H

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