1. Waterproof call button 2. 7 segment display receiver 3. 433.92mhz wireless call system 4. Aluminum Alloy Shell
How take a number system work : give a numeric serial number within 999 to the customers, when order is ready just press the number you want to call, the wireless display will voice accompanied by number display on the screen, easy to alert the guests their food is ready, user friendly operation.