The KORG GA-1 is a high-precision solo tuner for guitar and bass. - Brand: KORG - Model: GA-1 - Type: Solo Tuner - Features: For guitar and bass (up to 8 strings) - Connectivity: 1/4 inch input or built-in microphone - Condition: Unopened (in bag) I found a receipt from when I purchased it in 2017. Batteries were included separately, but they have expired, so I will dispose of them. You will need two AAA batteries, so please prepare them. Although it is unused, I have confirmed that it powers on for the purpose of this listing. Thank you for looking.