Product Specifications:Built-in Bluetooth + microphone.Hands-free callsSupports Advanced Audio Distribution ProfileOff time display functionDigital high-quality FM stereo radio，Preset 18 stations (frequency: 87.5-108 MHz)Support USB / SD / MMC card readerSupport Audio: MP3 / WMA / WAV，Support folder functionSupport breakpoints and ID3 PlaySupport Remote controlRotary Volume ControlMP3 randomized， 10 track up / down playbackElectronic control volume treble， bass， balance and faderMultiple EQ Scene Selection: jazz， rock， pop， classical， etc.Mute and Loudess controlL / R RCA audio output jacks4-channel high power output (4 loud speaker)Machine size: 178 mm (W) * 50MM (H) * 125 mm (D)Overall dimensions: 188 mm * 58mm (H)