4-Channel Receiver SystemPowers Up to 4 SpeakersBluetooth Wireless Streaming AbilityAM/FM Radio with Digital LCD DisplayUSB Flash & SD Memory Card ReadersMP3 Digital Audio File CompatibilityAux (3.5mm) Input Connector JackAbility to Connect External Devices(iPhone, Android, Smartphone, iPad, Tablet, etc.)(4) Pair Speaker Terminal Binding Posts(2) 1/4'' Microphone Inputs(2) Pair RCA (L/R) Audio Input Connector Jacks(2) Pair RCA (L/R) Audio Output Connector JacksConnects to TV, Home Theaters, External Speaker SystemsRadio Station Auto Scan, Tuning ControlBuilt-in Ventilation Cooling Fan50 Radio Station Memory Pre-SetsMain Volume/Balance/Treble/Bass ControlsMicrophone Volume/Bass/Treble/Echo ControlsIncludes Antennas, Audio Cable, Remote Control