420b Use Windows laptop how to adjust the density and speed?

*This shipping label printer support label width from 25.4-115mm（1-4.5"). * High-Speed Printing at 6"(152mm)/s. * Adjustable Printing Width between 1-4.25". * Thermal label printer works with all windows, mac, Linux systems. * Widely application for Amazon, eBay, USPS, UPS, etc. * Three interfaces can choose, such as USB, USB+Bluetooth, or USB+Wifi. How to buy? https://www.6printer.com/products/vretti-420b How to contact vretti? Email: support@vretti.net WhatsApp: +86 185 7560 0463 #vretti #vrettiprinter #thermalprinter #labelprinter #printlabel #420Bprinter