High quality: Bluetooth 4.1 Transfer the music to your speakers lossless, achieve excellent sound quality with D.S.P solution. Support mobile’s A2DP function, music will be played directly while the mobile phone is connected Multi-function: Bluetooth MP3 player developed for car-used, transmit the music from TF card to car stereo via FM radio signal. It can also be used as a hands-free car kit during driving LED display: LED show current voltage of the storage battery of your car and the name of songs or calling number USB Charger: Provide 5V/2.1A fast charge port. Available for charging handheld devices in car. You can use it charge for your iPhone 6,iPhone 5 and other devices, makes you do not worry your phone devices run out of juice in the car. Support wide frequency: The FM range from 87.5MHZ to 108.0MHZ, which can be adjusted by CH+ and CH- and support AUX input and output.