Green Label, made-in-Japan Boss analog chorus for electric bass. The unit has been tested and is fully functional, and the original box is included. No instruction manual or other documentation is included. Despite being a fairly old product, the effects unit itself is in very good condition. The serial number sticker in the battery compartment has peeled off due to aging, and there are traces of the sticker and scratches, likely from repeated battery changes, only on the inside of that area. Please check the attached photos. (The serial number sticker was not present at the time of purchase) Because the internal circuits are very similar, it is often used with electric guitars as a substitute for the famous CE-2 and CE-2w. (Indeed, the "Level" knob, which is not found on the CE-2, is a major advantage of this model) In recent years, I have heard that this model is becoming increasingly popular, especially among bassists in Europe and America. (Female session bassist Liv Thompson, among others, praised this model in an official BOSS interview) Please understand that this is a used item before purchasing.