Rolls' Podcast Pro Microphone/Source Passive Mixer is designed to mix a microphone with either RCA or 3.5mm source signals to a single XLR output at microphone level. This mixer consists of two balanced XLR jacks, one female input and one male output. It also has RCA input jacks and a 3.5mm input jack. A level knob for the attenuation of the source inputs of the unit (RCA and 3.5mm only). It has switches for allowing the input signals to pass through to the output of the unit and a ground lift switch for grounding the input and outputs sections together to help eliminate ground hum issues.