I am selling a Rockbox Boiling Point overdrive booster. S/N #212, domestic genuine product. I am the first owner, and it comes with all accessories. It has only been used indoors (non-smoking, no pets), so it is in very good condition except for some dullness on the metal parts due to aging. Of course, the operation has been confirmed. However, I am not a professional, so please understand that, except for the case where no sound comes out, all sales are non-cancellable and non-returnable. Thank you very much.