4G smart locked strap GPS bracelet anti-disassembly community correction Beidou/LBS/WIFI positioning health monitor wristband.1.Beidou/GPS/WIFI/LBS multiple precision position modes.2. SMS receiving.3. Two-way conversation.4. Mechanical tamper alarm.5. IP68 deep waterproof and dustproof rating.6. Low energy consumption and long standby time.7. Historical track playback.8. SOS emergency dialing and call alarm.9. Electronic fence (forbidden) alarm.10. Alarm in key areas (no entry).