Wireless Calling System Restaurant Hotel Queuing Pager with 10 Table Bells 1 Receiver US Plug Item Type: Wireless Calling System Display Receiver Parameter: Frequency: 433.92MHz Material: ABS Working Voltage: DC5V1A Working Current: <130mA Standby Current: <550MA Receiver Sensitivity: -105dBm Decoding: Learning code Water Proof Rating: IPX4 Working Temperature: -20℃-60℃ Press Key Transmitter Parameters: Working Frequency: 433.92MHz Battery Type: 2 x CR2032 batteries Single Battery Capacity: 225mAh Emission Current: 10mA ± 3mA Standby Current: <1uA Open Distance: >200 meters Press Key: 1 Million times Water Proof Rating: IPX4 Working Temperature: -20℃~55℃ Single Key: CALL