The device is designed for the process of wild and long-term work activities, providing communication and predictive positioning functions Portable device with one-way communication and Beidou positioning capabilities for Beidou-3 short messages, supporting drowning Alarm, one click SOS active alarm and vibration function, and can connect to mobile phones and other devices through Bluetooth Short message. The device is able to complete alarms and position tracking in extreme environments without a network, which is a transmission The satellite communication capability improves the efficiency of field operations and provides safety guarantees for operations in non signal areas. The device has the advantages of small size and high power consumption protection level. Can be secured by anti fall back clamping On the life jacket, it should be used in conjunction with a fall detection extension line. The equipment is suitable for marine operators, flood prevention and rescue personnel, field inspections, and on-site operations Wear it with personnel working on water or in non signal environments.