Extension X-D4

Features：1. The semi-circular design has a smooth surface, the appearance is noble, elegant and unique, and it contains a Taiwan card. 2, can be inserted into the advertising menu with blue backlight. 3. With a rod antenna, the distance is long and can be placed directly on the desktop. 4. There are two key functions: service cancel. 5. There are four-button functions: ordering, service, checkout, and cancellation. 6. There are a variety of colors to choose from. 7. You can choose two to four keys to use according to your needs.