Gently used a SYP DKC-3000 Digital Key Controller tested and works great as you can see in the pictures no problems foundDescription:A product of SYP, Made in JapanThe DKC-3000 is intended to vary the interval of karaoke music (music sources) if that interval does not match the performer. The interval can be directly set in 5 steps (plus or minus at a semi-tone pitch). When the auto switch is set at ON, the key position will automatically return to point 0, Original Key, at the end of a play of the music. This item will be wrapped in lots of bubble wrap and extra packing paper so it’ll be secured.