The Marshall PEDL-91001 is a 2-button footswitch designed for the Marshall MA and JCM800 series amplifiers. It allows for hands-free control of the Clean/Overdrive and Boost functions, enhancing live performance flexibility. This footswitch features LED indicators for clear status visibility and is specifically tailored for these amplifier models. For detailed compatibility information, it's recommended to consult your amplifier's manual or contact Marshall Amplification directly.