Product Specifications:Built-in Bluetooth+microphone. Hands-free calls Supports Advanced Audio Distribution Profile Off time display function Digital high-quality FM stereo radioPreset 18 stations (frequency:87.5-108 MHz) Support USB/SD/MMC card reader Support Audio:MP3/WMA/APE/FLAC/WAV etc.Support folder functionSupport breakpoints and ID3 Play Support Remote controlRotary Volume Control MP3 randomized，10 track up/down playback Electronic control volume treble， bass， balance and fader Multiple EQ Scene Selection:jazz，rock，pop，classical，etc. Mute and Loudess control L/R RCA audio output jacks 4-channel high power output (4 loud speaker) Machine size:178 mm (W) X 50MM (H)X 125 mm (D) Overall dimensions:188 mm X58mm (H)