This is a pickup system for acoustic guitars, primarily used by famous musicians overseas. It's an integrated system that combines the characteristics of a condenser microphone and a magnetic pickup. By blending the sound of the microphone with the magnetic pickup, it reproduces the natural warmth unique to acoustic guitars, as well as unique characteristics such as resonance depending on the player's playing style. The blend of the microphone sound can also be adjusted with a dial. It's in relatively good condition. It works without any problems. The battery cover was not included from the beginning. The battery was attached inside the body with double-sided tape and worked without any issues. The new price at Soundhouse is 36,800 yen, so this is a great deal at less than half price! Thank you!