Turn any road trip into a musical trip with this Bluetooth FM transmitter. It can play music from your smartphone/tablet through Bluetooth or directly from your microSD playlist. You can mount it easily on your car's air vent with its magnetic holder and use it to fast charge your smartphone/tablet with its QC3.0 USB port. The B4 transmitter remembers the last played song and FM frequency before shutting down and takes good care of your hands-free calls with its noise suppression and echo cancellation in-call functions.