[Upgraded Bluetooth 5.1 Chip]Compared to Bluetooth version, this Bluetooth 5.1 FM transmitter offers faster data transmission and less sound loss, optimizing transmission delay and connection error problem. clearer hands-free calls and . [PD 20W & QC 3.0 Fast Charger]Used as a USB car charger, it can fast charge 3 devices simultaneously with 3 charging ports. PD20W and QC3.0 ports 4x faster charging speed than standard chargers. Another USB port can charge as as can read music files in U disk, supporting MP3, WMA, WAV . [Hands-free & Voice Assistant]With a built-in microphone, this bluetooth car adapter supports smart voice navigation from your phone, streaming the audio from navigation app/Siri/Google Assistant to your car. /hang up/reject/ calls with one click of the button. The integrated microphone automatically switches from music playback to hands-free mode when a call comes in. [Voltmeter Display Screen & Colored LED Lights] The car voltage will be displayed when the FM transmitter is inserted into the car lighter. The screen will be flashing to remind you when Voltage 12V. In addition, this car bluetooth adapter has 7 different colored atmosphere lights, which makes more for driving. size: 2.36 x 1.57 x 1.57 inch Material: Plastic colour: black Package Contents: 1 x Car Bluetooth FM Transmitter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.