Smart QC 3.0 fast charging: Bluetooth FM Transmitter Auto has dual USB ports and can charge two devices at the same time. One is QC 3.0 USB port for fast charging, 4X faster than standard charger. [Compatible with: QC2.0, Hua Wei FCP, Samsung and HTC.) At maximum power, the charging efficiency is more than 80%, which can fully charge your device in a short time Bluetooth hands-free : Advanced Bluetooth 5.0 technology enables a more stable connection and faster transmission . The built-in high-performance microphone with CVC noise reduction technology gives you crystal clear hands-free calls after connecting Bluetooth. Just one button press, you can easily answer/end/reject/call last number. Drive Safer Multi Music Playback Modes: Enjoy lossless wireless stereo music transmission. The FM transmitter can play your favorite music from Bluetooth devices to car stereos via FM signals. The USB stick can be used to transfer and play MP3/WMA songs. This bluetooth FM transmitter can bring you wonderful car music and make your journey more fun With the wider 87.5-108.0MHz FM frequency, you can get a more stable and consistent music experience without interference< /p>Multiple protections and wide compatibility: Comes with built-in Smart IC, over current protection, over voltage protection, intelligent temperature control and short circuit protection. This Bluetooth car adapter can work as a hands-free kit with all Bluetooth devices for iPhone, iPad, iPod, tablet, Samsung, HTC, Sony and more Andriod smartphones