Wireless Calling System 1 to 30 Button Pager Restaurant Take Meal Equipment 110‑240VAU Plug Item Type: Wireless Calling SystemDisplay Receiver Parameter Description: Model: SU-620 Operating Frequency: 433.92MHz Material: ABS Working Current: 100mA±10mA Receiving Sensitivity: 105dBm Decoding: Learning the code Waterproof Rating: IPX4 Working Temperature: -20℃~ 60℃ Button Transmitter Parameter Description: Model: SU-A01 Operating Frequency: 433.92MHz Battery Model: 23A12V Battery Capacity: 60mah Emission Current: 10mA±3mA Standby Current: <1uA Open Distance: >500m Keys: 1 million times Waterproof Rating: IPX4 Working Temperature: -20℃~ 60℃ One Touch: Call How e: Button Function Description: Function Key: FUN Confirm Key: ENT Down Button: DOWN Left and Right Buttons: MOVE Up Key: UP F3-2: Last stay display time 1-99 seconds F3-3: Cycle interval time 1-99 seconds F5-3: Number of reports 1-9 F6-1: Delete all pagers F6-2: Restore factory settings (and delete all pagers) F7-1: Time setting