I purchased this item around 2020 from a used musical instrument store, where it had been serviced. The functionality has been confirmed. The main unit only. Suitable not only as a bass amplifier, but also for electronic drums and jazz guitars. It's versatile and can also be used for recording. I mainly used it for electronic drums, but I am selling it because I no longer have them. There is some crackling in the volume control, but I didn't experience any problems while using it. Spec Rated Output: 15W r.m.s. Terminals: High Input, Low Input, Rec Out, Headphone Out, Effect Send/Return Controls: Volume, Treble, Hi-Mid, Low-Mid, Bass Speaker: 1 x 25cm Speaker, 4Ω Power Consumption: 25W Power Supply: AC100V, 50/60Hz Dimensions: 456(W) x 390(H) x 242(D)mm Weight: 9.8kg