Tested and working. A high-cost-performance model from the GT series. It produces powerful sound that you wouldn't imagine from its simple, compact appearance. The GT-1 unit has one rubber foot missing. Also, the original box is not included. The adapter is a genuine BOSS product. The original box for this is also not included. The book shows signs of use, but there are no tears, stains, or folded pages. Also, it explains the GT-1 in an easy-to-understand way, which is very difficult to master through self-study, so please consider using it together when purchasing. The mesh case came with the purchase, and I used it because it's better than nothing. There are no tears in it. It shows considerable signs of use, so please consider it as an extra. The following are the new prices based on the BOSS online shop: GT-1 (unit)...¥25,300 GT-1 Textbook...¥1,500 AC Adapter ¥2,860