Feature:1. RF Wireless Technology: RF wireless technology, with stable system, long wireless receiving distance.2. Display Receiver: Display receiver supports 400 pagers, supports single button or 4 button pagers.3. Button Transmitter: Call button word selectable, call buttons that start with ABCDEF letters can be named, single or list display mode.4. Characteristics: Fashionable appearance and easy to move. 30 level digital control volume can be adjusted. The time, year, month, and date can be displayed.5. Uses: Using advanced micro processing chip, the performance is stable. Widely used in hotels, bars, restaurants and offices, etc.Specification:Item Type: Restaurant Pager SystemMaterial: ABSDisplay Receiver Parameters:Operating Frequency 433.92mhzWorking Current: <130mAStandby Current: <550mAModulation Method: ASKReceive Sensitivity: Better Than -105dbDecoding: Learning to CodingWaterproof Grade: Ipx4Working Temperature: -20 to 60Button Transmitter Parameters:Operating Frequency: 433.92mhzBattery: 2 x Built in Cr2016 Button Batteries (included)Battery Capacity: 80mahEmission Current: 10ma3maStandby Current: <1uaOpen Distance: >200 MetersKeystrokes: 1 Million TimesWaterproof Grade: Ipx4Working Temperature: -20 to 55Four Keys: Call, Checkout, Order, Cancel.Package List:1 x Display Receiver20 x Button Transmitter20 x Film1 x User Manual1 x Adapter