This is the SOURCE AUDIO Manta BASS FILTER, an envelope filter/auto-wah for bass. I found it very useful as it allows for detailed sound shaping. Velcro tape is attached to the back. Accessories include the box, manual, rubber feet, and power adapter. Please feel free to ask any questions you may have. Also, I am not accepting price negotiations. If you purchase this item along with other items I have listed, I will offer a small discount. Please let me know. Basically, I am selling as-is, no returns. Type: Bass