E-MU EM7700 Professional USB/Midi Controller Keyboard with 25 Full Size Keys 25 full-size professional keys with Aftertouch - the Xboard 25 is a true performance controller with a high-quality synth-action keybed 16 Real-time control knobs and 2 transpose buttons Footswitch/Pedal and Mod/Pitch Wheel Data/Master Volume Slider USB, AC and Battery powered