V5.1 Bluetooth Transmitter- The Bluetooth V5.1 chip establishes an ultra-secure connection between your device and the bluetooth car adapter. Faster and more stable connection than bluetooth v4.2, to avoid some unstable connection as well. You could make hands-free call, texting, navigation by Siri/ Google Assistant or other voice assistant without distraction to your driving. 20W PD QC 3.0 Efficient Charging - The car radio Bluetooth has 3 USB charging ports. The first one is designed with QC 3.0 Quick Charge which quickly charges your device to 50% in only 30 minutes; the second one is designed with music symbol which can both charge your device and read USB disk to play music; the third one is Type-C 20w PD which is 4X faster than standard car charger. One-key Bass Adjustment- The car Bluetooth transmitter is designed with a button "b" which can provide you the bass sound effect to enhance the songs like heavy bass songs or light music. You will have a different auditory sensation. Moreover, the car FM transmitter supports for from Bluetooth devices or USB flash disks to play music. Upgraded Microphone Design- Our car FM transmitter is equipped with an enhanced microphone which can receive sound around all directions while driving. The bluetooth for car is able to reduce noise for clearer Hands-free calls. Easy to Set UP- Insert the Bluetooth transmitter into car cigarette lighter and modulate same frequency with your car's. Then connect your device to the Bluetooth car adapter. The car radio bluetooth can be used with any 12-24V cars or Bluetooth device such as iPad, iPhone, iPod, HTC, Galaxy, Sony, MP3 player, tablet and Android Smartphones. If you don't need the light, long press to turn it off.