[. . . ] Making music on a PC or MAC is easier than ever before with TerraTec's MIDI MASTER USB: Connect the keyboard with only one cable, turn it on and . . . [. . . ] Well thought-out USB functionality: under current operating systems for Mac or PC, the MIDI MASTER USB is directly available as input device. Furthermore, the OUT socket at the rear can be used as independent MIDI interface for connecting additional devices and accessed by every music software. Of course, the MIDI MASTER USB can also be used without a computer as a pure MIDI keyboard. Last but not least: the voltage supply can be selected freely from a power supply or the USB, thereby saving an additional cable under your desk! [. . . ] Power supply via USB Connector for optional external power supply (9 V DC) Transpose function (transposing) Octave up/down button +/- keys · · · · · · 6 function keys 10 numeric keys USB MIDI driver for Windows 98, SE, ME, Windows 2000 and XP and Mac OS9 with OMS 2 meter USB cable System Requirements (in USB operation) Windows 98/98SE/ME/2000/XP MAC OS9 Art. Nr. : EAN-Code: Warranty: 1448 4017273614489 24 month MICIMASTER USB 2002 ­ 03/2002 ­ page 1 / 1 All company names and trademarks are registered trademarks and brand names of their respective owners. [. . . ]