urface treatment: frosted    Batteries used :2 23A 12V alkaline batteries          Product color: black    Battery life: about 24 months          Surface key :PC    Anti-skid bean: environmental protection strong silica gel          Button life: about one million times      Applicable host: the whole line of fast ring host              Main functions and features:  1. Color lamp Deckard integrated pucker. When the call button is pressed, the Deckard signal light diverges bright and clear blue light  2. Long range emission  3. Three buttons, three functions (This product has three buttons. One is the service key, one is the checkout key, and one is the cancel key. Knot. The product itself is equipped with insert board, which provides a platform for customers to publicize.  4. Stable registration method (signal transmission is stable, with a stable registration method, no garbled phenomenon.)  5. Resistant to temperature and humidity changes are not affected by Ming Pass, thunderstorm and environmental changes. Resistant to temperature and humidity changes is safe, stable and highly reliable.  6. The number can be changed at will, and it is highly reusable  Widely used in restaurants, hotels, cafes, teahouses, bath, KTV, dessert bar, buffet and other places.         Product usage diagram