THIS IS FOR A KORG BT-2 BASS TUNER. BASS REGULAR TUNER AND BASS FLAT TUNING AUTO AND MANUAL. COMES IN USED BUT GOOD CONDITION IN ORIGINAL BOX WITH INSTRUCTIONS. TAKES A 9V BATTERY TO WORK (NOT PROVIDED) PLEASE SEE THE PHOTO OF THE EXACT BASS TUNER YOU WILL RECEIVE AND FOR THE CONDITION THANKS FOR LOOKING WELL PACKAGED AND A QUICK DELIVERY