The TM-T20III comes with a built-in USB interface. You can select from two models: 1) USB + Serial, 2) Ethernet, making the model a long-term investment as it is possible to switch connectivity at any time. Its print speed of 250mm/sec can save you time and its competitive price and running costs can save you money; ideal for when you need to beat queues quickly. The combination of its fast print speeds, high reliability and economical operation, make this printer a must-have for small retail and specialty stores, hospitality venues and grocery stores.