Our upgraded wireless Bluetooth car audio receiver adapter comes with two charging ports. At the same time, it adopts advanced Bluetooth V5.0 chip. Compared with other ordinary products on the market, it provides faster pairing and more stable connection, and the audio will not be distorted. Even on rugged mountain roads, it can effectively avoid problems such as unstable connection or playback stuck. Now you can easily enjoy wireless high-fidelity stereo music and hands-free calls. And at the same time, it can also provide extremely fast charging for your phone device. Product Parameters: Bluetooth version: V5.0 Screen type: LED Audio playback format: MP3, WMA, FLAC, APE Working voltage: 12V-24V Input current: 4.1A (smart current) Signal to noise ratio: 85dBA Radio band: 87.5-108MHz Support expansion: U disk: ≤64G, TF card: ≤64G Dual USB charging ports Quick charging: QC3.0+5V/Max 2.4A Standard charging: Total 5V/Max 3.4A Very easy to use Bluetooth mode: 1. Insert it into the car lighter, use the mobile phone to search for Bluetooth (HY87) and click connect. 2. Adjust the frequency of the device to the same frequency as the car radio (87.5-108MHz). (Note: In order to make the sound quality better, please find a blank fm frequency.) 3. Now you can easily enjoy music or make hands-free calls. 4. Short press [previous song/next song] to switch songs. 5. Long press [previous song/next song] for +-volume. 6. Press [Function Key] to play or pause music/answer/reject/replay the call. Use other extensions (U disk/TF card) 1. Insert the U disk/TF card into the device and adjust the frequency to the same frequency as the car radio. You can easily enjoy wireless stereo music. 2. Short press [Previous/Next] to switch songs. 3. Long press [previous song/next song] for +-volume. 4. Press [Function Key] to play or pause the music.