B00S0J0F1C Roland A-500 PRO-R 49-Keys MIDI Keyboard Controller

Velocity-sensitive 49 keys with channel aftertouch
Inspiring feel & response for serious players
45 assignable controls: knobs, sliders, buttons, transport & more
8 Dynamic Pads for finger drumming & MIDI triggering
Sure-grip Pitch Bend/Modulation Stick
Expand playability with Sustain & Expression Pedals (available separately)
USB Bus Powered ??o AC adaptor required (AC adaptor is an optional)