This product has a wide range of applications, including hotels, restaurants, coffee shops, and entertainment venues. You can call 1-998 numbers to minimize the number of people waiting in line, reduce employee confusion and improve the atmosphere, notify customers faster, reduce employee costs, improve work efficiency, and enhance the restaurant's image. Specifications: Size 106 x 51 x 11mm Receiving sensitivity -114dB Standby time is about 20 hours Receiving frequency 433MHz Reminder method: buzzing and LED flashing The transmission distance is about 300 meters in a wide field of view Keyboard base: size 238 x 151 x 30mm, transmission power 240mW, transmission frequency 433MHz