The MPM-3004U powered mixer features dual high efficiency amplifiers (225W + 225W) with a multi echo effects system and built-in USB/SD Mp3 player. A customized amplifier, speaker protection circuit and a fan cooling system helps this system run smooth and cool while protecting your speakers from being permanently damaged. The strong metal chassis design makes it light weight and give the unit additional protection during transportation and storage and is ideal for small venues and performances.