TECH21 SANSAMP BASS DRIVER DI Functionality not confirmed. The can has some scratches. I used it by placing it on top of my head and pressing it with my hand, so I think it's in good condition. The main unit has no tape marks. Please understand that it hasn't been used for many years. For specifications and operating instructions, please search the product name. You can find the official manual or blogs by people who explain it. Please consider this item as used, so please understand.