Feature:1. Stable Transmission: The radio frequency wireless technology ensures stable performance and long distance.2. Novel Design: This wireless calling system adopts fashionable appearance and novel design, and it can display "time, year, month and day".3. Powerful Receiver: This patient pager system provides 1 PC display receiver which supports 400 call buttons.4. Adjustable Volume: The volume of this customers pager system is adjustable in 30 levels, meeting different needs.5. Wide Application: This wireless calling system provides 10Pcs call buttons and 1 PC display receiver. Perfect for restaurant, nursing home, cafes, supermarkets, hotel, hospital wards, emergency center, banks, schools, factories, construction sites.Specification:Item Type: Wireless Calling SystemMaterial: ABSDisplay Receiver Parameters:Operating Frequency: 433.92MHzOperating Current: <130mAStandby Current; <550mAModulation Mode: ASKReceiving Sensitivity: Better Than -105dBDecode: Study CodeWaterproof Grade: IPX4Operating Temperature: Minus 20 to 60Button Transmitter Parameters:Operating Frequency: 433.92MHzAlkaline Battery Model: 12V23A (Included)Battery Capacity: 30mAhTransmitting Current: 10mA3mAStandby Current: <1uAOpen Space Distance: >200 Meters / 218.7ydKeys: A Million TimesWaterproof Grade: IPX7Operating Temperature: Minus 20 to 55Single Button: Call.Package List:1 x Receiver10 x Call Buttons10 x Sticker1 x User Manual1 x Adapter