I used this in the past, but I've been storing it for the last few years. The inside of the battery box is rusty. Also, I tried to check the operation before listing it, but I don't have the equipment on hand to do so. The adapter will probably work because the inside of the battery box is rusty, but I can't guarantee it because I don't have an environment to check. Please purchase with your understanding. Type...Electric Guitar Manufacturer...BOSS