he Zebra ZP500 Plus is the "Fedex Version" of the current generation Zebra GX420D Desktop monochrome direct thermal printer. Loading this printer with a a GX or GK420D performed flawlessly on all of the applications we tested with. (ebay, paypal, stamps.com, endicia.com and more - if you have a different application let us know and we can check compatibility for you) with resident EP and ZPL. Why pay up to 3X more for the exact same results. The ZP 500 Plus also has the power supply built in to the base of the unit. With the added memory and higher speed, up to 6" per second, it replaces the classic desktop LP 2844 and the 2844Z when following our basic setup instructions. We recommend installing this printer as the standard Zebra GK420D or GX420D. It is compatible with all of the programs we've tested it with that call for the the GK or GX420 printers. with both the EPL and ZPL programming languages. These include most major shipping programs like Fedex, UPS, Stamps.com, Endicia, Paypal, ebay and a host of other programs. We provide the drivers, setup instructions, and tech support under our full 90 day warranty. Hippo has been refurbishing and offering the Zebra printers at a large discount for the past 12 years. We have over 30,000 satisified, loyal customers. We sure expect to be offering Zebra printers next 12 years as well. Feel free to contact us M-F 8-5 Central at 785-456-2430 with any questions regarding compatability or if you'd like some piece of mind, knowing you've selected the right printer for the job with the right support to get you started.