Yep. They came with a couple of novelty shirts I bought for my son years ago. It had a plastic fretboard on the front of the shirt with some type of sensor that triggered samples of power chords/Marshall sounds. Lots of fun but when the shirts conked out I kept the mini amps. They have a weird multi pin input that I always planned to convert to mini-jack or even 1/4 inch TRS. Havent got round to it yet.Does the mini amp say ThinkGeek?