Product Description About 30-40 years ago, our entertainment, was either watching TV or listening to CD music. Music entertainment was provided in a "CD Component" or in a "Receiver" system. A Mixer is a device in-between a "Player" on one side and an Amplifier on the other. The Mixer is built-in with 2 or 3 Mic inputs. The music played out from a Player and the Singer's vocal will go into this equipment, mix together and channel out to the Amplifier (Receiver)/Speakers. Features Withstand Power Amplifier Output 4 Mic Inputs (2 in front, 2 at rear) MP3 USB Player Bluetooth (Name: MIX-MP3 BT) to sing with music from phone, I-PAD Different Sound Effects (KTV, HALL, CHORUS, MEETING) Reverberation 2 RCA Audio INs, 1 RCA OUT CONNECTION: Audio Output from your Player to Audio Input of the Mixer Audio Output from the Mixer to Audio Input of your Receiver