1Stable Transmission: The radio frequency wireless technology ensures stable performance and long distance. 2Novel Design: This wireless calling system adopts fashionable appearance and novel design, and it can display "time, year, month and day". 3Powerful Receiver: This patient pager system provides 1 PC display receiver which supports 400 call buttons. 4Adjustable Volume: The volume of this customers pager system is adjustable in 30 levels, meeting different needs. 5Wide 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. Item Type: Wireless Calling System Material: ABS Display Receiver Parameters: Operating Frequency: 433.92MHz Operating Voltage: DC5V Operating Current: