Digital display tuner, compatible with DC 9V power supply. - Model Name: PB-X1 - Brand: KORG - Power: DC 9V - Function: Tuner - Display: Digital display Thank you for viewing. Batteries are not supported. I used it in an effects board for about a year. I didn't have many opportunities to take it out, so please be aware of that. There are traces of double-sided tape on the back. Please refrain from purchasing if you are concerned. #korg #Pitchblack #tuner #electricguitar #guitar