... label printer Serial RS-232C /485 /(serial TTL& Parallel interface) WH-AA Stylish, delicate and elegant appearanceVery silent ... Serial RS-232C ,485 ,or (serial TTL & Parallel interface)Add coordinate curve printing functionAbundant figure/curves/characters print functionEasier ... roll paper (57mm wide, 30mmø)Interface Serial RS-232C /485 /(serial TTL& Parallel interface)Input Power DC 5V ,3AOperating ...