Easy to Setup: Simply plug DESFLOW FM Smart transmitter into your car cigarette lighter and connect to phone bluetooth, choose a car’s empty FM frequency ( from 87.5 to 108 Mhz) and tune FM transmitter into same frequency. It will automatically transforms your car into smart modes with quick charging, stereo Hi-Fi music, hands-free calling and voice control. | Enjoy Stereo Music : DESFLOW wireless FM Smart transmitter integrates A2DP and DSP technology to provide your crystal clear voice and Hi-Fi music. | 3.0 Quick Charge & PD Fast Charging: With 3.0 QC technology & PD Type-C, DESFLOW wireless FM Smart transmitter charge your smart devices so fast that you can get 80% in 30 minutes which is 4x faster than traditional chargers. It’s a perfect car adapter plus charger all in one place so you can charge your phone and play music with Bluetooth at the same time | Safety First: with Hands-Free Calls and Siri Voice Assistant, DESFLOW wireless FM Smart transmitter use noise cancellation technology for clear Hands-Free calls just by pressing calling button 3 times to initiate Siri Voice Assistant so that you are able to drive safely. You can also press the button twice to redial last phone call. | Multiple Safety: DESFLOW wireless FM Smart transmitter has multiple protection against battery shortage, over-current, overcharging, overheating and high temperature will guard the safety of your devices and your car battery.