Citizen CL-S631. Maximum resolution: 300 DPI. Print technology: Direct thermal / thermal transfer, Print speed: 100 mm/sec. Interface: USB 1.1, Serial, Ethernet, Optional connectivity: Ethernet, Serial (RS-232), Connectivity technology: Wired. Width: 231 mm, Depth: 289 mm, Height: 270 mm. Compatible operating systems: Windows 7/XP/2003/2008/Vista