Pioneer microphone mixer, model MAA-550. Cleaned and operation confirmed. There is a problem with the echo switch for microphone 1. The switch does not turn on or off, but echo can be applied using the knob. Microphones 2 and 3 can be used without any problems. The exterior has considerable scratches and dents, but mixing and key control have also been confirmed, making this a perfect unit for karaoke use at home or at small events. No accessories, body only.