The Adastra MM321 1U Rack Mixer with Bluetooth, USB Player and FM Tuner is a rack-mountable 1U mixer with built-in media player and Bluetooth receiver. 3 mono inputs connect via XLR microphone or line input (switchable). Each of these inputs has switchable +20V phantom power for use with condenser microphones or D.I. boxes and channel 1 has a variable priority function. Two stereo auxiliary line inputs are provided on RCA connectors with a stereo record output. Media player operating modes include 3.5mm Aux input, USB audio player, FM radio tuner and Bluetooth receiver for playback from a smart phone or tablet. Main left and right outputs are fed to XLR with an additional mono summed output on 6.3 jack. Versatile yet easy to use as a main mixer for background music, public address and house PA systems.