Purchased about three years ago and installed on a guitar, but it's hardly been used. This is a Seymour Duncan acoustic pickup, also used by a certain Japanese acoustic guitarist. Compared to LR Baggs, the sound is quite natural. It uses a 9V battery. The high frequencies are a bit strong, so everyone adjusts the angle and depth of the pickup with a wrench. There are no major scratches. It can be used normally. (The battery is for reference only and cannot be included, please understand.)