ADJUSTABLE WIDTH OF LABEL SIZE: VRETTI shipping label printer for 4x6 will print on pretty much any thermal label you can find. This desktop label printer will prints at any label width between 1'(25.4mm to 4.5'115mm), max print width is 4.25'(108mm) maximum print length 70'. Ideal for 4'x6' shipping labels,warehouse labels, barcode and id labels, mailing labels etc. Support printing roll label and fanfold label. WIDE OF CONNECTIVITY RANGE: VRETTI shipping label printer compatible with windows XP, 7, 8, 10 and newer,Mac and Linux System by USB connection. Perfect for Amazon,eBay, Shopify, Etsy, PayPal,UPS, USPS, stamps and others.(Not included the label holder.)