Feature:1. Radio Frequency Wireless Technology: The pager system is stable and the wireless receiving distance is long2. Support Pagers: The display receiver supports 400 pagers, supports single key or 4 key pagers, call button words can be selected, single or list display mode3. Multifunction: The call button can be named with the letter ABCDEF at the beginning, the time, month, day can be displayed, and the 30 level numerical control volume can be adjusted4. Microprocessing Chip: This product adopts advanced microprocessing chip, which makes its performance stable and reliable Fashionable and novel design, easy to move5. Multipurpose: Widely used in various places such as home, hotel, bar, restaurant, factory, workshop, tea house, clubhouse, bowling alley, massage room and country club, hospital, health club, and officeSpecification:Item Type: Wireless Calling SystemProduct Material: ABSDisplay Receiver Parameters:Operating Frequency 433.92MHzWorking Current: <130mAStandby Current; <550mAModulation Method: ASKReceive Sensitivity: Better Than -105dBDecoding: Learning CodeWaterproof Grade: IPX4Working Temperature: -20℃~ 60℃Button Launcher Parameters:Operating Frequency 433.92MHzBattery: 2 x Built in CR2016 Button Batteries (Included)Battery Capacity: 80mAhEmission Current: 10mA±3mAStandby Current: <1uAOpen Distance: >200mKeystrokes: 1000000 TimesWaterproof Grade: IPX4Working Temperature: -20℃~ 55℃Four Keys: Call, Checkout, Order, Cancel.Package List:1 x Display Receiver30 x Button Launcher30 x Film1 x User Manual1 x Adapter