As shown in images 3 and 4, the main unit has numerous scratches, and the keyboard is also discolored on the right half, but it works without any problems. All keys, knobs, and buttons responded without issue. The connection method is USB-B. (The cable is not included, but it is sold inexpensively at stores like Hard Off and 100-yen shops) A compact 25-key MIDI keyboard, the KORG microKEY-25. 25 keys - Model Name: microKEY-25 - Brand: KORG - Condition: Scratched Thank you for viewing.