Feature:1. Auto start after ignition, Can display the current car battery voltage, Below 10V alarm, monitor your car battery at any time.2. Support U disk & TF card, lossless music playback, multiple audio formats MP3//WMA/WAV/FLAC.3. Audio /music playback car bluetooth A2DP.4. Support bluetooth HFP/HSP, OPP, A2DP/FLAC, PBAP profiles.5. Vioce prompts the caller number when a call cames in. Digital display calling number.6. For other compatible music device or your MP3/MP4 player, connect to the headset hole using the audio line also to beable to launch car audio through the FM transmitter, let you enjoy the music.7. Can display staus information:EQ frenquency point, Volume, Playing time.8. The bluetooth hands-free blutooth headset with DSP full duplex, for echo cancellation, noise reduction function.9. Durble USB (Universal Serial Bus) double charging cureent with 2.5A output, charge for iphone/ipad/samsaug/nokia/mot.10. On phone / After charging equipment, display screen can display the charging current.11. Power switch DC12V-24V wide power supply suitable for variety of cars: (24V power supply truck). Specification: Frequency channels: 87.5-108.0MHZTransmit distance: 5 M Audio format: MP3/WMA/WAV/FLACSNR: 68db Frequency response: 20 Hz-15KHZLeft & right channel saparation: More than 60 D Bbluetooth version: bluetooth 3.0+EDRbluetooth Profiles: HFP/HSP, OPP A2DP/AVRCP, PBAPOperating voltage range: DC12-24 V Power consumption: Less than 1 W Output voltage: 5V+/-0.25USB maximum curent output: 2.5 A Package Included:1 X Car FM