Smart QC 3.0 fast chargingBluetooth car transmitter 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. At maximum power, the charging efficiency is more than 80%, so your device can be fully charged in a short time Bluetooth hands-free systemAdvanced 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 a crystal clear hands-free function after connecting Bluetooth.Multi-music playback modesEnjoy lossless stereo music transmission.The FM transmitter can play your favorite music from Bluetooth devices to car radios via FM signals.The USB stick can be used to transfer and play MP3/WMA songs.Easy Operation-Plug Bluetooth FM transmitter into the cigarette lighter.-Connect your smartphone to the FM transmitter via Bluetooth -Set a free FM frequency on the radio.Press the call button and then use the arrow buttons to enter the same frequency as in the car radio.Select and play music on your smartphone.With the wider FM frequency of 87.5-108.0MHz, you can get a more stable and consistent music experience without interferenceMultiple Protection & Wide CompatibilityComes with built-in smart IC, over-current protection, over-voltage protection, intelligent temperature control and short circuit protection.