Widely used in restaurants, cafes, medical clinics, and hospitals to facilitate communication between customers or patients and service staff. This device works when connected to wireless call buttons; the employee or nurse wears the watch, and when the customer or patient presses the call button, the alert signal appears directly on the watch screen. Key Specifications and Features.. Supports up to 999 call buttons: One watch can be paired with a very large number of buttons to cover wide areas. 7 Alert Modes: The watch allows for a combination of vibration, sounds (ringing), and backlight depending on the nature of the place (e.g., silent vibration alert in hospitals). Advanced LCD Screen: Displays the last 3 received calls simultaneously and can store a log of up to 300 calls. Powerful Rechargeable Battery: Features a built-in 380mAh lithium battery, providing up to 72 hours (3 days) of continuous operation on a single charge. Water and Dust Resistant: Comes with an IP55 protection rating to withstand harsh working environments and water splashes. Wide Transmission Range: Transmission covers a distance of up to 100-150 meters in open areas.