This is a piezo pickup that came with a used guitar I purchased. The manufacturer and specifications are unknown. It was installed so that two knobs could be operated from the soundhole. I checked the sound before removing it, but the rubber? on the surface of the pickup part at the saddle was partially torn when removing it (photo 3), so I'm considering it as a junk item. The control knobs were attached to the inside of the soundhole with double-sided tape, and the battery box was attached to the base of the neck inside the body. The endpin of the body is a cable jack. I will also include the case for the 9V battery.