Compact guitar amplifier with adjustable gain, bass, treble, and level. Purchased new as part of a guitar set, but it's unopened because I already had an amplifier. Since it's unopened, the operation hasn't been confirmed. There are some scratches on the packaging cardboard due to storing books on top of it, but there was no strong impact. - Brand: Playtech - Model Name: Jammer Jr - Function: Guitar Amplifier - Controls: Gain, Bass, Treble, Level - Series: Mini Series Thank you for looking.