Bluetooth Wireless In-Car FM Transmitter with Dual USB Charging, Music Control, Card Reading + AUX Input and Hands-Free Calling for Smartphones and Tablets Advantage: 5-in-1 design, wireless bluetooth in-car multifunction FM transmitter enables you to do hands-free calls, enjoy clear music, GPS voice navigation, charge your device Built-in microphone and FM transmitter, full frequency: 87.5-108MHZ. Wirelessly transmit phone call and music from Bluetooth mobile phone to the car FM stereo system Dual USB charging ports (2.1A Max) ideal for charging two devices simultaneously, keep your devices powered on the go This product not only can play the MP3 music from your cellphone by 3.5mm audio cable but also support USB flash disk playing Adapting with professional-grade bluetooth Module, this product can play the music from your phone, tablet PC or U disk nondestructive by your car's stereo