Nady MM-14FX 4-Channel Microphone Mixer with integrated echo effect &ndash; &frac14;&rdquo; Inputs & output &ndash; Delay time & Depth controls 4 mono 1/4" Microphone Inputs with individual volume controls mixed to one single 1/4" line level output.this mixer is not a stand-alone device, it should be connected to the amplifier Compact design with a heavy-duty steel construction, smooth-turn ultra-stable pots, and high-quality jacks for lasting durability The mixer delivers high-quality audio with up to 50dB of gain per channel, low distortion, a high signal-to-noise ratio, and a wide frequency response to bring out all of the details in your audio Decay time and depth control knobs let you adjust the built-in echo DSP to simulate the decay reverb of rooms, halls, and stadiums The front panel has an on/off switch with an indicator LED. The mixer can operate on a 9V battery, or via an optional external AC/DC adapter for terrific versatility Though it can be used in many applications, the MM-14FX is designed for use with dynamic microphones. If using otherwise, please be aware that significant volume increases may incur some signal distortion.