This vintage Shure Brothers, Inc. Model M688 Stereo Microphone Mixer is a great find for any audio enthusiast. With five mic inputs, four channels, and one bus, this mixer is perfect for live performances or studio recordings. The mixer is powered and has five line inputs, one phono input, and RCA input and output ports (AES3). It's a versatile piece of pro audio equipment suitable for a range of musical instruments and gear. The Shure Model M688 is a stereo mixer, designed for use with microphones. This mixer is in good working condition, powers on, and is ready to use.