you have done wrong, fun and practical. Built-in 1000mAh rechargeable battery, working in low noise, the thermal printer does not need ink cartridge when using, low operation cost. Connection Method: Support Wireless BT 4.0 connected with smartphone and USB cable connected with PC. Please follow the user guide to download relative APP(PeriPage)/driver on your devices. Compatible with Windows Android iOS System. Thermal Paper Specs: Printer with high quality print head, can print 57mm(width)x30mm(roll diameter) thermal paper, 304DPI resolution, super clear printing quality. Specifications: Color: White/Pink/Blue/Red/Brown/Yellow/Mint Green/Black(optional) Material: ABS #43; PC Input: 5V,2A Resolution: 304DPI Connection: BT/USB Printing Speed: Max. 15mm/s Paper Type: Thermal Paper Paper Width: 57mm Roll Diameter: 30mm Thermal Paper Compatible: Notes Paper/Sticker/Label/Photo Paper Built-in Battery: Rechargeable Lithium Battery 1000mAh Charge Time: About 2 Hours System Supported: Windows Android iOS BT Version: 4.0 Item Size: 7.9 * 7.9 * 4.2cm / 3.1 * 3.1 * 1.7in Item Weight(with paper roll): 188g / 6.6oz Package Size: 10.0 * 8.5 * 5.1cm / 3.9 * 3.3 * 2.0in Package Weight: 239g / 8.4oz Notes: Please read the user guide carefully when your start to use the product. Please download the app before use and connect the device via app. Quick press the print button twice and it will automatically print out the paper with 2D barcode. Scan it and quickly connect the device. Then start printing! If the printing goes wrong, please check the installation of paper roll or contact us. Thanks #xff01; Packing List: 1 * Thermal Printer with Paper 1 * USB Cable 1 * User Guide