Product Features: This product is a car cup type of bluetooth MP3 Player with extension 2 way cigarette lighter. Equiped with dual USB port fordevices charging and output 5V/3.1A max, Built-in FM Transmitter, MP3 Player and Bluetooth wireless transmission chip, The devicecan play the music from USB flash or mobile phone through bluetooth. Supports to play lossless music which can make you enjoy themusic and hands-free calling during the driving. Functions:1. Display the car battery voltage when the car started, and monitor the voltage any time.2. Support to read the music from USB flash, include the lossless music.3. Transmit music from mobile phone to your car stereo with high quality sound through bluetooth A2DP technology.4. Supports HFP/HSP/OPP/A2DP/AVRCP/PBAP bluetooth protocols.5. Voice report the caller ID and display it on screen.6. 2 way cigarette lighters with 100W max, and work for car pump and vacuum cleaner.7. Full FM channel from 87.5-108.0Mhz8. Built-in microphone and support hands-free caliing with echo and noise cancellation.9. Equiped with dual USB charging ports with output 5V/3.1A max.10. Input voltage 12-24V, suitable for using most of cars.11. Screen display the charging current when any device charged.