Multi-function guitar amp with effects - Brand: PositiveGrid - Model Name: Spark 40 - Features: Master volume, effect adjustment, input terminals - Design: Black leather finish, mesh speaker grill - Controls: Gain, Bass, Middle, Treble, Reverb, Delay, Modulation The Spark 40 is a 40W compact amp developed by Positive Grid, known for their BIAS amps, for practice and jamming. The dedicated Spark app can automatically generate bass & drum tracks for jamming and automatically display the chords of your favorite songs. It's a truly multi-functional amp that deserves to be called the next generation of practice gear. Highly recommended for those looking for a home practice amp that will last a long time. There are some scratches, but I think it works fine. Thank you for looking.