61-key MIDI keyboard, USB connection, with volume slider, pitch bend, and modulation functions. - Model: KEYSTATION 61 MK3 - Connection: USB - Features: Volume slider, pitch bend, modulation - Number of keys: 61 keys Thank you for viewing. I have been using this set up permanently for about 3 years. There is no box or manual, only the keyboard and USB cable. There are scratches on the black keys and the back, but there are no problems with the operation. I would like to sell it for the listed price.