Prints up to 2.94″ per second at 203 dpi(dots per inch) for print clarity.Direct thermal printers use heat instead of ink and are typically smaller,quieter,faster,and more energy-efficient than dot-matrix printers.Support Android&Window system;Support USB,power adapter of mobile power charging.Wireless Bluetooth capability lets printer connect wirelessly to an Windows&Android smartphone for printing or support windows system printing.Weighs 600g;measures 113x103x45 mm/4.45×4.06×1.77 inches(LxWxH);NOT COMPATIBLE WITH SQUARE OR CLOVER.