Designed for outdoor working, such as printing taxi bill, parking bill, express delivery invoice, restaurant ordering, ticket selling and so on. Specifications: Print Method: Thermal line printing BT Version: 4.0, Battery: 7.4V, 1500mAh, Charging Time: 2-4 hours, Standby Time: 100 hours, Print Speed: 50~80mm/s, Resolution: 203dpi (8dots/mm), Paper Type: Thermal Paper Thickness: 0.05 - 0.10mm, Paper Width: 57mm +/- 0.5mm, Print Width: 48mm +/- 0.5mm Rolling Paper, Diameter: ≤40mm, Barcode Type: UPC-A, UPC-E, EAN-13, EAN-8, CODE39, ITF25, CODEBAR, CODE93, CODE128, QR code, PDF417. Working Temperature: (-10-50)℃ Storage Temperature: (-20~70)℃. Supporting Image Formats: JPG, BMP, TIF, JPEG, etc. Supporting System: Android, IOS, Windows (through USB) Item Size: 10" x 7.5" x 4.5"cm/ 3.9" x 2.9" x 1.8"in Item Weight: 190g/ 6.7oz The battery is covered with insulating tape, please take it off before use. Package List: 1 x Printer 1 x USB Cable 1 x User Manual (Chinese, English). With BT function, supports Android, IOS and Windows, convenient for you to print data from your device wirelessly Direct thermal printer, more quiet and fast working, saves energy Efficient and clear printing, print speed can reach to 80mm/s Built-in 1500mAh rechargeable lithium-ion battery, can work continuously up to 8 hours. It can be powered by power bank Small size and lightweight, easy to carry