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 System Material: ABS Display Receiver Parameters: Operating Frequency: 433.92MHz Operating Current: <130mA Standby Current; <550mA Modulation Mode: ASK Receiving Sensitivity: Better Than -105dB Decode: Study Code Waterproof Grade: IPX4 Operating Temperature: Minus 20℃ to 60℃ Button Transmitter Parameters: Operating Frequency: 433.92MHz Alkaline Battery Model: 12V23A (Included) Battery Capacity: 30mAh Transmitting Current: 10mA±3mA Standby Current: <1uA Open Space Distance: >200 Meters / 218.7yd Keys: A Million Times Waterproof Grade: IPX7 Operating Temperature: Minus 20℃ to 55℃ Single Button: Call. Package List: 1 x Receiver10 x Call Buttons10 x Sticker1 x User Manual1 x Adapter