Boomwhackers 5-Note Bass Chromatic Set Sonic Drive Natural Rebound Drum Practise Pad (8") use a 9-volt DC regulated

use a 9-volt DC regulated AC adapter(plug polarity is positive on the barrel and negative in the center)

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Boomwhackers 5-Note Bass Chromatic Set Sonic Drive Natural Rebound Drum Practise Pad (8") use a 9-volt DC regulated5 Note Chromatic Set. Bass Octave C#, D#, F#, G#, A#. Consists of the 5 sharps flats for our bass octave. This set combines with the Bass Diatonic Set to yield a lower chromatic scale, or combines nicely with the Chromatic Set for an extended range of notes.