Feature:1. Wireless signal transmission stable and long distance, highly antiinterference and system signal range covers over 600 feet in open area.2. Fashionable appearance and novel design, easy and convenient to move. Displayable time "year, month and day".3. The display receiver supports 400 pagers, onebutton or 4button pagersWord of call button is selectable, single or list display mode.4. 30 levels adjustable volume, and you can name the call button starting with ABCDEF, providing more convenience.5. Suitable 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 433.92MHzWorking Voltage: DC5VWorking Current: 100mA10mAReceiving Sensitivity: 105dBDecoding: Learning the CodeWaterproof Rating: IPX4Working Temperature: -20- 60Button Transmitter Parameters:Operating Frequency 433.92MHzBattery: Two Built-in CR2032 Lithium Batteries (included)Battery Capacity: 80mAhEmission Current: 10mA3mAStandby Current: andlt;1uAOpen Distance: Approx. andgt;200m / 656ftKeys: A Million TimesWaterproof Rating: IPX4Working Temperature: -20- 55Four Keys: Call, Check Out, Place an Order, CancelVoltage: 110-240V.Package List:1 x Wireless Receiver10 x Call Buttons10 x Stickers1 x Manual1 x AdapterNote:Transmitter shipped with builtand 8209;in battery Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.