Factor V4240 240W Mixer Amplifier 70 Volt 4 Input (Black) 240 watt mixer power amplifier with 4 inputs expandable to a total of 10 Inputs Front panel Input 1, Aux, Bass, Treble and Master volume controls Include tamper proof security caps. Front panel Aux input accepts a range of music signals from hand held devices such as iPod's, iPhones, cell phones, Mp3's or computers. Front panel USB charging port keeps hand held device batteries charged while in use. Back panel input 1 terminal block accepts microphone or line level (bal/unbal) signals with switchable 24V phantom power, mic/line, 100Hz HPF, priority and Includes stereo RCA inputs.