Touch panel Alphabetic keyboard for entering treatment objectives or patient names One hundred (100) free program memories. The stored programs can be sorted in alphabetical order, and a desired program can be selected simply by touching the patient name or treatment objective. Very low BNR, 2.4-3.6 according to IEC Selectable coupling sensitivity for regular or medicated gel Pleasant key-touch sound: Melodies in a “do-re-mi" scale can be selected. Choice of three different treatment-end melodies Enables combo therapy in conjunction with the ES-320 or the ES-521 electrotherapy unit