LEIGAO Product Quantity: 1pcs Color: black 4 Music Playing Mode 21 Keys Remote Control: This Bluetooth FM transmitter supports 4 music playing modes, work with TF card, U disk, AUX cable, and Bluetooth function. Supporting the operation of the 21-key remote control, everyone in the car can control the music playing, and enjoy the music atmosphere in every corner of the car. Fast Car Charging: The car audio transmitter supports QC3.0 fast charge, which charges 4 times faster than traditional charging ports. Another USB charging port supports 5V/2.4A output to your cellphone or tablet. It can charge two cellphones at the same time. Hands-free Calls Safer: Car Bluetooth adapter built-in mic with hands-free function, CVC noise reduction, make call quality is more clear. Support SIRI/GOOGLE voice assistant. It can answer/hang up/reject/switch to the private call answer model. Let your hands focus on driving only. Clear Sound Quality: The car audio FM transmitters use the latest Bluetooth connection and noise suppression (CVC) technology, the FM signal is more stable and static electricity is eliminated, so that the sound of calls and listening to music is clearer.