Features: A4 portable thermal printer, 300dpi resolution, 210mm paper width, no wires required, printing anytime and anywhere. Adopt advanced thermal printing technology, no ink cartridges or consumables are required, energy saving and environmental friendly. Built-in 2000mAh rechargeable battery, long standby time of 168 hours, can meet your printing needs on multiple occasions. Use with APP(Baypage), support BT and USB connection, compatible with Windows Android iOS system. With OCR function, the text on the picture can be converted into the text that can be edited. Mobile printer for printing PDF file, test paper, webpage, contract, photo, picture, etc. an excellent assistant for study and office work.