Smart QC 3.0 Quick Charge: The Bluetooth car transmitter has dual USB ports, which can charge two devices at the same time. One is a QC 3.0 USB port for fast charging, which is 4 times faster than standard chargers. (Compatible: QC2.0, Huawei FCP, Samsung, HTC). At maximum power, the charging efficiency is over 80%, so your device can be fully charged in a short time. Bluetooth Hands-Free System: Advanced Bluetooth 5.0 technology for more stable connection and faster transfer. The high-performance microphone with built-in CVC noise reduction technology provides you with crystal clear hands-free function after connecting via Bluetooth. You can easily set up answer/end/reject/dial last number functions with just one button press. Driving is safer. Multiple music playback mode: Enjoy lossless stereo music transmission. An FM transmitter can stream your favorite music from a Bluetooth device to your car radio via an FM signal. USB memory sticks can be used to transfer and play MP3/WMA songs. This bluetooth FM transmitter gives you great car music to make your journey more interesting. Simple operation: Plug this Bluetooth FM transmitter into the cigarette lighter socket. Turn on the cars FM radio and select an empty frequency. Then set the frequency to the FM transmitter (87.5 - 108.0 MHz). Connect your phone to the transmitter (named C57) via Bluetooth. With wider frequencies from 87.5 MHz to 108.0 MHz, you get a more consistent and distraction-free music experience.