4-Yr Depot Express Exchange WEP Warranty for ML420/ML421Protect your printer from the unexpected with a return-to-depot warranty. Affordable coverage provides peace of mind for your printer and your bottom line. Just bring your printer directly to an authorized Oki® service center for expert, speedy service. Conveniently available at the time of purchase through the 90th day of ownership. Warranty/Service Plan Time Period: 4 yr; Warranty/Service Plan Type: Hardware Support; Addition/Extension: Addition.