Location query: the user's specific location can be queried via mobile phone or computer Electronic fence: delineate an area on the map with the device as the center, and alarm immediately when the area is out Historical trajectory: query the equipment running trajectory within three months, anywhere SOS for help: In case of emergency, press the SOS button to send a distress call and message to the guardian Address book: add/check supervision numbers (SOS, father, mother)/whitelist/friends (50 in total) through the guardian's mobile APP Two-way conversation: when the address book number comes in, you can talk to the user Find device: If the device is lost, the device can be found through the mobile APP Alarm: set through the guardian's mobile APP Class anti-disturbance mode: set the do not disturb time range through the guardian's mobile APP, and the device will block incoming calls Remote shutdown: the device shutdown function can be realized through the guardian's mobile APP Remote restart: the device restart function can be realized through the guardian's mobile APP Smart power saving: turn off/on GPS and data upload within the time frame Multiple control methods: Mobile client/computer service platform/GZH Specification: Multiple positioning modes: GPS + AGPS + Wifi + Beidou + LBS Universal GSM+GPRS quad-band system: 850/900/1800/1900MHz Battery capacity: 5000mAh Product size: 80*45*30mm Standby time: 90 days Waterproof: IP67