BOSS Bass Equalizer GEB-7 Includes: Unit / Outer Box / Instruction Manual / Warranty Unit Size: 12cm (H) x 6.3cm (W) x 5.5cm (D) Battery and adapter operation confirmed Simple cleaning completed 9V battery replaced Velcro attached to the back. Can be directly integrated into a board. (Image: 3) A classic 7-band graphic equalizer designed specifically for bass, allowing for fine adjustment of the most effective frequency bands. It can adjust a wide range of 50Hz to 10kHz by ±15dB, and further control boost/cut by the LEVEL knob for your preferred equalization settings. Purchased new at a store and used a few times at home, but I'm selling it because I don't use it much anymore. It has been used sparingly, and the deteriorated battery and bushings have been replaced with new ones, so there are no noticeable operational problems or scratches. However, it has been stored for a considerable amount of time, so there is some yellowing on the outer box and knobs. Please refer to the images. Also, please understand that this is a used item. The item will be shipped in the original outer box, which will then be wrapped in cushioning material and packed in a cardboard box.