Upgrade your car audio system with this versatile Bluetooth Car FM Transmitter. Equipped with Bluetooth 4.0 + EDR, it supports hands-free calls, Bluetooth music streaming, and caller ID display. Play your favorite tunes directly from TF cards or USB flash drives in MP3 or WMA format. The dual USB ports (5V/2.1A and 5V/1A) charge your smartphones, tablets, and other devices quickly while driving. Featuring a 1.3-inch dot matrix LED display, AUX input/output, car battery voltage indication, and multi-language support, this transmitter combines convenience, safety, and superior sound quality in one compact design.