The Roland Jazz Chorus 50 is a 50W guitar amplifier with a 12-inch speaker and six control knobs. I received it about 30 years ago and have been using it at home for practice ever since. There is some rust and crackling. It shows signs of use, so please refrain from purchasing if you are sensitive to such things. - Model Name: Jazz Chorus 50 - Brand: Roland - Number of Control Knobs: 6 - Speaker Size: 12 inches - Output: 50W The cart it's on is not included. Thank you for looking.