Smart QC 3.0 quick charge: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 chargers. (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 offers you crystal-clear hands-free calling after connecting Bluetooth. Just one button press, you can easily set 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 provide you with 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 Protection 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 any Bluetooth device for iPhone, iPad, iPod, tablet, Samsung, HTC, Sony and more Andriod smartphones