The zebra gk420d direct thermal printer offers the best value in a basic desktop printer featuring a fast 5 inches per second print speed to meet your low to medium volume printing requirements the gk420d has a sleek and compact design boasts the smallest footprint in a 4 inch desktop printer and supports a variety of applications and industries the gk420d comes standard with epl and zpl programming languages and dual connectivity usb serial for easy integration into existing systems