Mainly, these are a larger operator screen, at 8"-diagonal, faster printing times of up to 50 pages per minute, and double the RAM capactiy, at 256MB. It is also versatile in that it can handle labels, heavy paper and recycled paper or other unique forms of printing (e.g. bar codes). Its processor operates at 514MHz and its RAM can be expanded up to 768MB. Its scanner can email scanned documents or save them directly to USB flash memory. The whole unit can also detect the size of paper being scanned or copied to select the proper tray to print from. It also has some more advanced fax features, like junk fax blocking, speed dial, fax queue and fax saving to USB. Maximum print resolution is 1200 x 1200 dpi, and paper input and output capacities are 3100 and 500 sheets respectively. It also has security functions like SNMP v3, SSL and IP Security.