Nady MM-14FX  4-Channel Mixer
The MM-14FX by Nady Systems is a  4-channel mini mixer with echo effects to create amazing sound. Four mono ¼” microphone inputs with individual volume controls, plus built-in echo effects DSP with delay time and depth controls for the ultimate mixing effects. Features ¼” unbalanced output  and up to 50dB of gain per channel. Power the MM-14FX on and off by switch, with convenient LED indicator.  Mixer is 9VDC powered with either 9V alkaline battery or optional PAD-1 AC/DC external adapter.