Shure M68FC Microphone Mixer
The Shure M68FC is a five-channel, portable microphone mixer for use with sound reinforcement, tape recording and audio-visual systems.

Four XLR microphone inputs with individual slide switches for low impedance (balanced or unbalanced) or high impedance (unbalanced).  One high-level auxiliary input for tape, tuner, and accessories. Master Volume and Individual volume control to balance each input.  High- (unbalanced) or low-impedance (balanced or unbalanced) microphone level output.  High-impedance auxiliary output. DC power supply jack supplies 28 volts dc for use with accessories. Size 11x5x2.5.