The CL-S621 is a precision engineered, fast and easy-to-use unit that includes all the capabilities of the CL-S521 plus the option to print in both direct thermal and thermal transfer modes.   The printer also features Citizen’s Hi-Lift™ metal mechanism and the innovative ARCP™ anti-wrinkle and automatic tensioning system.Paper width: Variable paper width - 0.5 inches (12.5 mm) – 4.6 inches (118.1 mm) Paper load: Durable design - Citizen's proven Hi-Lift™ all-metal mechanism Printing Speed: Fast print out - 6 inches per second (150 mm per second) Media support: Large media capacity - holds rolls up to 5 inches (127 mm) Ribbon options: Wide range of ribbon options - Uses up to 360 metres inside and outside wound ribbons Paper thickness: Paper thickness up to 0.250mm Hi-Open™ case for vertical opening, no increase in footprint and safe closing. No more unreadable labels - the ARCP™ ribbon control technology assures clear prints. Low space requirement - integrated power supply enables clean work station Energy:Internal power supply for reliability Media sensor: Black mark sensor Adjustable media sensor Label gap sensor Tear bar: Standard tear-bar for perforated tags