Restaurant Pager System 20 Pagers Stylish Wireless Coaster Pager System for Hotels Bars Restaurants Item Type: Restaurant Pager System Material: ABS Display Receiver Parameters: Operating Frequency 433.92mhz Working Current: <130mA Standby Current: <550mA Modulation Method: ASK Receive Sensitivity: Better Than -105db Decoding: Learning to Coding Waterproof Grade: Ipx4 Working Temperature: -20℃ to 60℃ Button Transmitter Parameters: Operating Frequency: 433.92mhz Battery: 2 x Built in Cr2016 Button Batteries (included) Battery Capacity: 80mah Emission Current: 10ma±3ma Standby Current: <1ua Open Distance: >200 Meters Keystrokes: 1 Million Times Waterproof Grade: Ipx4 Working Temperature: -20℃ to 55℃ Four Keys: Call, Checkout, Order, Cancel