The MXR M80 Bass D.I.+ is a super popular and standard model bass preamp and DI. This single unit can cover everything from clean tones to heavy distortion, making it a legendary device that's very easy to shape your sound with. • As shown in the images, the battery cover on the back is missing. • There's no problem at all for those who intend to use an AC adapter or power supply. • Overall, there are signs of use (scratches and dirt), but the operation has been confirmed, and the switches and knobs respond well. Please purchase only if you understand that this is a used item with a missing part (battery cover). This is an auction for the main unit only. If you want to get a standard preamp at a low price, please consider it! #MXR #BassDI #M80 #BassPreamp #EffectPedal #Bass #DI Thank you for viewing.