This item came with a wood bass I purchased, but I'm not using it, so I'm putting it up for sale. I've tested the sound output on both the microphone side and the pickup side, and confirmed that it works. It's a passive type, so it doesn't require batteries. It's an old item. The knobs have been replaced, so I'm including the original dice knobs that came with it. *I am selling this on behalf of a family member. I don't know much about this product, so I will answer questions to the best of my ability. Please feel free to ask any questions you may have.*