This is the VOX COOLTRON series overdrive, the Big Ben. I purchased it used and only used it indoors, but I am selling it due to various circumstances. I think it's a pretty excellent overdrive, producing a slightly soft distortion. It's a shame that it's no longer in production. There are some stains on the sides and back that are difficult to remove, but it works perfectly. Operation has been confirmed with an AC adapter and batteries (4 AA batteries). This listing is for the unit only. How about this discontinued, excellent overdrive? Thank you.