Upgrade Bluetooth 5.3SOARUN Bluetooth 5.3 adapter provides faster data transmission and lower sound quality loss, optimizes transmission delay and connection failure issues. PD 20W & QC 3.0 Fast ChargingThe car adapter can fast charge two devices simultaneously via PD20W and QC3.0 ports, 4 times faster than standard chargers. In addition, it has another USB charging port (5V/2.4A), which can also be used as a USB flash drive to play music. Unique Large LED DisplayWhen the FM transmitter is plugged into the car cigarette lighter, it will display the vehicle voltage, FM channel, Bluetooth connection status. It is convenient to monitor the condition of the car battery and the working status of the FM transmitter. Hands-Free Calling & Voice AssistantBuilt-in microphone supports Siri voice assistant and Google voice navigation. One-touch MFB button to answer/end/reject/transfer calls easily. When a call comes in, the integrated microphone automatically switches from music playback to hands-free calling mode. Colorful LED BacklightSOARUN car FM transmitter has 7 kinds of colorful atmosphere lights, which can be switched to green/red/blue/yellow/cyan/purple/white.