Print Resolution: 600 DPI Printing Type: Thermal / Thermal Transfer Print Speed: Up to 4 ips Maximum print width: 104 mm (4.09 ") Maximum print length: 1016 mm Structure: metal structure, with visual transparent window size: 505 mm (L) × 270 mm (W) × 308 mm (H) roll loading: 208.3 mm (8.2 ") diameter ribbon loaded 1" diameter, maximum loading 600 m ribbon processor: 32-bit ARM9 architecture, 200MHz Memory: 4MB FLASH Memory 8MB DRAM Transmission Interface: RS-232C (2400-115200 bps), n Centronics (SPP mode), USB 2.0 Operation Panel: LCD liquid crystal display, 3 LED lights, 6 set of keys flu detector: penetrating sensors, reflex sensors, ribbon end sensor, mark sensor head up, peel the paper sensor