Product features: 1. Modular serial port for imported sensors: Long service life, sensitive sensing, and more accurate detection 2. 4G IoT information synchronization: Low latency, wide network coverage, and low power consumption, fast synchronization of information 3. Multiple wearing methods, portable and unobstructed operation: Easy to carry, can be hung on a safety helmet and worn on the wrist, releasing both hands without affecting normal work. Easy to carry, can be hung on a safety helmet and worn on the wrist 4. One click fall alarm call