It is an analog amp simulator pedal to cope Fender, Marshall, and Mesa-Boogie sound, very similar to Tech 21 NYC’s Sansamp GT-2, with 16 programmable presets and 3 switchable HF roll-off settings, at the size of your palm. Best of all, this Russian made stompbox sounds so good and cheaper than GT-2! You gotta be mad not to check it out.