Detachable design; The case and strap are designed with soft silicone and are detachable for easy cleaning. Battery capacity; Built-in 400mAh lithium battery; 48 hours of standby time when fully charged; Suitable for daily use in restaurants without frequent chargin. Using distance; The distance can reach 100m (open area); The actual distance depends on the environment; Indoor use distance is 40-60m, which meets most restaurants. Reminder method: Alert the waiter through buzzer; Vibrate; Flash; You can adjust the reminder method according to your environment need. Pairing method; Pair the call button with the waiter’s watch receiver before use; Customizable watch number and button function; Expandable to up to 500 pagers.