Citizen CL-S621-GRY. Maximum resolution: 203 DPI. Print technology: Direct thermal / thermal transfer, Print speed: 100 mm/sec. Interface: USB 1.1, Serial, Optional connectivity: Ethernet, Parallel, Wireless LAN, Connectivity technology: Wired. Internal memory: 16 MB, Flash memory: 4 MB. Width: 231 mm, Depth: 289 mm, Height: 270 mm