[Wireless in-Auto Bluetooth Adapter ]: , It is very good little tool. It can transmit the music in the mobile phone to the car speaker clearly and loudly, it almost no noise. Moreover, The Bluetooth hands-free dialing/receiving calls that works well, double USB charger port for your mobile charge, equipped with colored LED lights to create a driving atmosphere. [Easy to use]: You can mount it on the car air vent or on the dashboard. The 1.1-meter cable provided means this device can be used anywhere in the car.In addition, when a call comes in, the bluetooth car adapter will automatically switch from the music playback mode to the bluetooth hands-free mode. [2 Charging Ports & Bluetooth hands- free ]: The car bluetooth adapter supports charging 2 devices simultaneously, one QC 3.0 charging port (5V/3A), another USB charging port (5V/2.4A). the USB radio bluetooth adapter supports hands-free calling , you can answer/ reject/ redial calls with one click ,make driving . [Wide compatibility]: It supports for Android and IOS systems, with the Smart bluetooth 5.0 chip which background noise reduction that makes the car music and phone calls clearly. The bluetooth car aux adapter has three modes of music playing, via Bluetooth connecton /micro-SD card / Aux In, choose you way to play your music. [7 Lighting Effects]:The FM bluetooth car transmitter has 7 lighting adjustment modes , which can be used to illuminate the car inside and match different music mood.Short press the "M" button to switch the light color, the LED light will change from the order of red/orange/yellow/green/cyan/blue/purple. Product Model:BC49BQ Working Voltage:12V-24V Bluetooth Version:5.0 + USB1 output:5V/2.4A USB2 output:QC 3.0 (5V/3A ,MAX) Transmitting Frequency Range:87.5-108.0MHZ Support for playback formats:Bluetooth MP3,micro-SD card,Aux In Car Radio Transmitter Support:SIRI/ voice assistant; navigation voice prompts;private answer Colour: as shown Material: ABS Size: 6.5 x 5 x 2.3cm Package Contents: 1 x 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.