Amuoc FMV9 5-in-1 in-Car FM Transmitter Bluetooth Wireless Adapter with Dual USB  Charging, Music Control, Card Reading & Hands-Free Calling Amuoc advantage: 5-in-1 design, wireless Bluetooth in-car multifunction FM transmitter Built-in microphone and FM transmitter, full frequency: 87.5-108MHz 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 music from your phone, tablet pc/ U disk nondestructive by your car's stereo