The Pyle Pro PMXU43BT is a compact 4-channel, Bluetooth-enabled audio mixer designed to provide multi-channel mixing capabilities for DJs, musicians, sound engineers, and performers in clubs, conferences, houses of worship, and live stage applications. It features two XLR-1/4" combo jack inputs and one stereo pair of 1/4" jacks. The microphone preamps offer selectable 48V phantom power and up to 64 dB of gain.All input channels boast 3-band EQ and peak indicators. A per-channel send knob passes signal to the internal 16-bit DSP effects engine, which has 16 selectable effect presets. A mono 1/4" aux send and return is provided in case external effects are desired. Stream music from your mobile device to the built-in Bluetooth receiver, or play MP3 audio files from your flash drive via the USB Type-A port. Additionally, the USB port enables audio interface functionality when connected to a computer. Hook up monitors to the 1/4" main and monitor outputs and connect a set of headphones to the 1/4" stereo headphone jack, which sports a dedicated level control.