Dual DSEQ505BT Bluetooth Smart EQ Processor for Smartphones Control balance, fader and 7 band EQ with 20 presets from a Bluetooth connected device (app required, free download) Works with Apple and Android smartphones and tablets, including iPhone and iPad Bluetooth (A2DP) audio streaming 3 Pairs of RCA preamp outputs (F/R/S) (High level (speaker wire) and low level (RCA) inputs) Subwoofer gain control, signal sensing for auto amp remote turn-on