The Rolls MX41b is a compact utility mixer used to expand inputs on a console, mix CD players, consumer audio gear, computers, etc. This simple, compact mixer features four 1/4" phone and 1/8" mini inputs with level fader controls. The rear features stereo 1/4" outputs for feeding an amplifier, additional mixer, etc. The MX41B requires no external power, making it an ideal solution for indoor and field use.