The Retekess T117 Restaurant Paging Calling System includes 11 alert buttons designed for use in restaurants, cafes, and bars. These buttons have a compact size of 64 x 61 x 15mm and operate on a wireless frequency of 433MHz with a range of 200m in open areas. The system features four key functions: Call, Cancel, Pay, and Order, and is powered by 3V CR2016 batteries. With a working temperature ranging from -20 to 55 Celsius, this pager system is reliable and efficient for business communication in the service industry.