1、Versatile Wireless Calling System: With advanced digital coding technology, this system supports up to 400 call buttons for various venues, ensuring stable long distance transmission. 2、Large Display Screen: The large digital screen provides real time accurate call information visible up to 50 meters, enhancing service efficiency in restaurants, hotels, and offices. 3、Convenient Volume Control: With 30 levels of volume adjustment, you can easily adjust the sound level based on different environments, making it suitable for any occasion. 4、Customizable Call Buttons: Enhance service quality by using customizable call buttons for easy identification of specific needs. This feature ensures a more tailored and satisfying service experience. 5、Stylish and Portable Design: This wireless calling system features a fashionable design that is easy to move around, suitable for a wide range of applications with a modern appearance. Item Type: Wireless Calling System Material: ABS Rating: IPX4 Working Frequency: 433.92MHz Display Receiver Parameters: Operating Voltage: DC 5V 1A Operating Current: <130mA Standby Current: <550mA Receiving Sensitivity: -105dBm Decoding: Learning Code Operating Temperature: -20℃ to 60℃ Button Transmitter Parameters: Battery Type: 2 x CR2032 Batteries (Included) Single Battery Capacity: 225mAh (Included) Transmitting Current: 10mA ± 3mA Standby Current: <1µA Open Area Distance: >200m Button Life: 1,000,000 Presses Operating Temperature: -20℃ to 55℃ Button: CALL 1 x Display Receiver 20 x Button Transmitters 20 x Stickers 1 x Adapter 1 x User Manual