Bluetooth Specification: V2.0Supports advanced audio distribution profileOff time display functionDigital high-quality FM stereo radioPreset 18 stations ( frequency: 87.5-108 MHz )Support USB / SD / MMC card readerSupport Audio: MP3 / WMA / APE / FLAC / WAV etc.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 loud controlL / R RCA audio output jacks4-channel high power output ( 4 loud speaker )Support modes: BT / APE / WAV / WMA / MP3 / FMThe remote control battery (not included ): CR2025 3V Specifications:FM RadioTuning Range: 87.5 - 108.0MHzSensitivity: Less than 20dbStereo Separation: More than 25dbSNR: More than 60db Some PlaybackMusic format support: MP3 / WMADisplay format: ID3 displayDistortion: Less than 0.3 percents Power Supply12V Machine: 11 - 16VNote: This machine is 12V machine, not according to the 24V power supply AudioOperating temperature: -20 - 60 deg.CQuiescent current speaker impedance: 4 ohmFrequency Response: 20 - 20000Hz FuseRed: 1AYellow: 15A  Type: Car MP3 PlayerSpecial Function : FM Radio, Bluetooth, Hands-free calls, MP3 Player, USB flash diskOutput Power : 4 x 60WVoltage : 12VMusic Source: SD card, 3.5mm stereo headphone jack, Cellphone, Flash driveBuilt-in EQ: Rock, Classic, Pops, JazzSNR (dB): =60dbDegree of Distortion (%): =0.3%FM Channel: 87.5 - 108.0MHzBluetooth Version: 2.0Media Format : WAV, WMA, Mp3Package weight: 0.714 kgPackage Size (L x W x H) : 22.00 x 18.50 x 8.00 cm / 8.66 x 7.28 x 3.15 inchesPackage Contents:1 x JSD - 520 FM Radio ,1 x Remote Control(no battery),1 x Wire,1 x Installation Tool Set,1 x User Manual