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 amp. Since it's unopened, the operation has not been confirmed. There are some scratches on the cardboard packaging due to storing books on top of it, but there has been no strong impact. - Brand: Playtech - Model Name: Jammer Jr - Function: Guitar Amplifier - Controls: Gain, Bass, Treble, Level - Series: Mini Series Thank you for looking.