Item Type: Wireless Calling System <br>Material: ABS <br>Display Receiver Parameters: <br>Operating Frequency 433.92MHz <br>Working Voltage: DC5V <br>Working Current: 100mA±10mA <br>Receiving Sensitivity: 105dB <br>Decoding: Learning the Code <br>Waterproof Rating: IPX4 <br>Working Temperature: -20℃~ 60℃ <br>Button Transmitter Parameters: <br>Operating Frequency 433.92MHz <br>Battery: Two Built-in CR2032 Lithium Batteries (included) <br>Battery Capacity: 80mAh <br>Emission Current: 10mA±3mA <br>Standby Current: <1uA <br>Open Distance: >200m <br>Keys: A Million Times <br>Waterproof Rating: IPX4 <br>Working Temperature: -20℃~ 55℃ <br>Four Keys: Call, Check Out, Place an Order, Cancel <br>Voltage: 110-240V1、Wireless signal transmission for stable and long distance, highly anti?interference and system signal range covers over 600 feet in open area. <br>2、Fashionable appearance and novel design, easy and convenient to move. Displayable time "year, month and day". <br>3、The display receiver supports 400 pagers, one?button or 4?button pagers.Word of call button is selectable, single or list display mode. <br>4、30 levels adjustable volume, and you can name the call button starting with ABCDEF, providing more convenience. <br>5、Suitable for restaurant, nursing home, cafes, supermarkets, hotel, hospital wards, emergency center, banks, schools, factories, construction sites.Transmitter shipped with built?in battery1 x Wireless Receiver<p>20 x Call Buttons</p><p>20 x Stickers</p><p>1 x Manual</p><p>1 x Adapter</p>