Features: 1.WIRELESS CONNECTION: The mini printer can be connected to your smartphone via Bluetooth, allowing you to print photos and documents anytime, anywhere. 2.CLEAR PRINTING RESULTS: Mini thermal printer has a print resolution of 200DPI for clear printing results. Can be used for students' wrong questions or photos. 3.VERSATILE PRINTING OPTIONS: The printer supports thermal printing and black and white printing on 57x25mm, 57x28mm and 57x30mm paper sizes. 4.LONG BATTERY LIFE: The pocket printer has a built in 1200mAh lithium battery that provides long lasting power for all your printing needs. 5.LIGHTWEIGHT AND PORTABLE: The mini thermal printer is made of premium ABS material, compact, lightweight and easy to carry. specification:Item Type: Mini Thermal Printer Material: ABS Connection: BT APP: For WalkPrint Printing Parameter: 200DPI Printing Method: Thermal No Ink, Black and White Printing Printing Paper: 57 x 25mm / 2.2 x 1in, 57 x 28mm / 2.2 x 1.1in, 57 x 30mm / 2.2 x 1.2in (one roll included, need to be purchased separately after use) Battery Type: Built in 1200mAh Lithium Battery PackageList:1 x Mini Thermal Printer 1 x User Manual 1 x Data Cable 1 x Printing Paper (Built in)