This is a Phil Jones Bass headphone amplifier, as you know. I purchased it new and used it for several years. It works fine, but sometime ago the switch started to have poor contact. The power turns off unless the knob is fixed somewhere between the on and off positions. This was quite stressful for me, so I bought another mini-amp and am now selling this one. - Model Name: BIGHEAD - Brand Name: PHIL JONES BASS - Included items: As shown in the pictures (no box) 7500