PolarLander Car Radio Audio USB/SD/MP3 Player Receiver Bluetooth Hands-Free with Remote Control Black 1 Din Intelligent Bluetooth Call: Supports hands-free calls , making it convenient to receive calls and safe to drive. No need to pick up the phone using hands which provides guarantee for safety driving. Radio Function: FM radio with high-quality digital stereo, which can search channels in full-automatic way,semiautomatic way and accurate adjustment way.Support the three-band radio store(FM1-FM2-FM3),which can store 18 radio channels in advance.( Radio Frequency: 87.5-108MHz) Support Dual USB(U disk) /SD card playing: Support vast USB/SD storage equipment,and you can download the songs you like into the storage equipment to play,which is very convenient.(I have tested in person that memory card with 32GB storage can be played in a flash) (Only support 5V charging) AUX audio input: Support external AUX(3.5MM plug) to onput into the audio,such as navigation,MP3,MP5,Mobile phone audio and so on,input through the front-terminal AUX audio, and output sound from the car's speaker Support the adjusting of multiple sound effect models and independent output(for example: Treble, Bass, Balance, Fader),Support name indication of ID3 English songs. Support folder play function. Sound effect models: classic,jazz,pop,rock. Bluetooth Specification: V2.0 Supports advanced audio distribution profile Off time display function Digital high-quality FM stereo radio Preset 18 stations ( frequency: 87.5-108 MHz ) Support USB / SD / MMC card reader Support Audio: MP3 / WMA / APE / FLAC / WAV etc. Support folder function Support breakpoints and ID3 Play Support remote control Rotary 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 loud control L / R RCA audio output jacks 4-channel high power output ( 4 loud speaker ) Support modes: BT / APE / WAV / WMA / MP3 / FM The remote control battery (not included ): CR2025 3V Operating temperature: -20 - 60 deg.C Quiescent current speaker impedance: 4 ohm Frequency Response: 20 - 20000Hz Type: Car MP3 Player Special Function : FM Radio, Bluetooth, Hands-free calls, MP3 Player, USB flash disk Output Power : 4 x 60W Voltage : 12V Music Source: SD card, 3.5mm stereo headphone jack, Cellphone, Flash drive Built-in EQ: Rock, Classic, Pops, Jazz SNR (dB): 60db Degree of Distortion (%): 0.3% FM Channel: 87.5 - 108.0MHz Bluetooth Version: 2.0 Media Format : WAV, WMA, Mp3