With the same feeling of the original tonewheel organ’s pedalboard, just shorter and lighter (18 notes),  this is great for gigging musicians. Expression pedal included!
The power supply adapter is optional, but if you play it with a Legend organ you don’t need it since the pedalboard is powered via the midi cable.
The Pedalboard 18 is a MIDI pedalboard, therefore you can use it with other brands MIDI instruments, but in that case you will need the optional power supply adapter.