1.With BT function, supports Android, IOS and , convenient 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 , 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, -13, -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, (through USB) Size:10 * 7.5 * 4.5cm Material:ABS Colour:blue Package Contents: 4 * Printer 4 * USB Cable 4 * User Manual (Chinese, English) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.