Portable Bluetooth Thermal Receipt PrinterModel: NT 1809DD It applies mobile products to supporting the use, and suited to outdoor work environments. The feature has small size, light weight, reliable performance, simple to connect, easy to use. Can be compatible with Android and iOS operate systems. Led indicator (know well rest power at any time) Built in rechargeable 1500mAh lithium ion battery, standby time can reach 5 6 days. Bluetooth 4. 0, auto sleep, auto awake, save electricity.