1.With BT function, supports Android, IOS and Windows, convenient for you to print data from your device wirelessly. 2.Direct thermal printer, more quiet and fast working, saves energy. 3.Efficient and clear printing, print speed can reach to 80mm/s. 4.Built-in 1500mAh rechargeable lithium-ion battery, can work continuously up to 8 hours 5.Small size and lightweight, easy to carry.Designed for outdoor working, such as printing taxi bill, parking bill, express delivery invoice, restaurant ordering, ticket selling and so on. 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 Paper Thickness: 0.05 - 0.10mm Paper Width: 57mm +/- 0.5mm Print Width: 48mm +/- 0.5mm Rolling Paper Diameter: less than equal 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) Size:10 * 7.5 * 4.5cm Material:ABS Colour:blue Package Contents: 4 * Printer 4 * USB Cable 4 * User Manual (Chinese, English)