Feature: 1. HIGH PERFORMANCE WIRELESS TECHNOLOGY: Adopting high performance wireless technology to ensure the signal transmission is stable and reliable, and the paging effect is obvious, which enhances the service efficiency. 2. STYLISH, PORTABLE: It has a stylish design, novel appearance and portable, easy to move. No matter where you are, you can quickly call for service, providing convenience for users. 3. HIGH SENSITIVITY DISPLAY RECEIVER: The display receiver can display the current time, year, month and day, which is accurate and convenient, and it is convenient to record the call time and improve the working efficiency. 4. MULTIPLE APPLICATION SCENARIO: It is suitable for various places such as home, hotel, bar, restaurant, factory, etc. It has a wide range of applications to meet the call and service needs of different places. 5. WATERPROOF: This call system has an IPX4 waterproof rating, which effectively prevents water from entering the inside of the device, thus protecting the device from water damage. Specification: Item Type: Wireless Restaurant Service Call System Material: ABS Display Receiver: Operating Frequency: 433.92MHz Display Receiver Size: Approx. 210x140x30mm / 8.3x5.5x1.2in Receiving Sensitivity: 105dB Decoding: Learning Code Waterproof Rating: IPX4 Operating Temperature: -20℃- 60℃ Pushbutton Transmitter: Operating Frequency: 433.92MHz Battery Type: Lithium Battery Battery Type: 2xCR2032 Single Transmitter Battery Capacity: 240mAh (Built In) Transmit Current: 10mA±3mA Standby Current: 200m / 656.2ft Keystroke: 1 Million Times Waterproof Rating: IPX4 Operating Temperature: -20℃-60℃ Single Key: CALL. Package List: 20 x Restaurant Call Button20 x Stickers1 x Instruction Manual1 x Display Receiver1 x Power Adapter