Users include Bob Tyrell, Robert Hernandez, Tin Tin, and Paul Booth, and many more...Automatic recognition from 110 volts to 220 volts no switch to remember complete with micro adjustment dial to fine tune the running of your machine. Small Power Pack Ideal for use on conventions. operates from 1-15 volts. 3 Amps Output. Auto switch from 110 To 240 Volts Jack plug Sockets Auto recognition of Foot Switch and Clip cord .