The Mad Professor 1 recreates the brown sound of modified Marshalls, as typified by Van Halen in the 70s and early 80s. It features a wide range of gain, allowing for settings from overdrive to heavy distortion sounds. It also features a reverb that simulates 70s studio reverb, making it easy to enjoy the classic HR/HM style with just one unit. The rubber on the bottom is slightly misaligned. Never used outside, works perfectly! Accessories: Box