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 Citizens Hi-Lift metal mechanism and the innovative ARCP anti-wrinkle and automatic tensioning system. Cross-Emulation enables automatic recognition of Zebra, ZPL and Datamax, Internal Power Supply, Easy media loading