Monocrystalline microcomputer architecture. Single with ABS material panel and IP67 rated waterproof switch (can be soaked in water, will not malfunction). A dual function buttons and the rope, to call or eliminated.
Features:
1. crystal microcomputer architecture design.
2. single with ABS material panel and IP67 rated waterproof switch (can be soaked in water, will not malfunction).
3. with the emergency bell and clear buttons and other words and buttons to call and cancel.
4. with LEDs to indicate call status.
5. emergency call button activated, only thus clear the call state, the host can not be cleared.
