Check the listing for details. Bluetooth FM Transmitter MP3 Player Hands-Free 42W PD+QC3.0 Car Charger Adapter. Color: Black, Condition: New. Listed at 20.69 USD. Operations:FunctionOperationPower On/OffPlug/Unplug the product into/out from your car charger portDisplay car battery voltagePlug the product into your car charger port, the display will show car battery voltage for 1 secFrequency Up/DownLong press the “MFB” button, then press the "Next"/“Previous” button or rotate the “MFB” to add/reduce frequencyPlay/Pause/Answer/Hang upPress the “MFB” onceReject a callLong press the “MFB” for about 2 secondsRedial the last numberPress the “MFB” twiceVolume Up/DownRotate the “MFB”Next/Previous SongPress the "Next"/“Previous” button onceSwitch light modePress the “Light switch” buttonSwitch music sourceLong press the "Next” button to switch from Bluetooth mode or U disk mode music, when switch to Bluetooth mode, you have to press “MFB” once to start the music.Activate phone voice controlIn Bluetooth mode, long press the “Light switch” button Features：1. Type-C and QC3.0 port for fast charge, DC output 5V 3A/ 9V 2A/12V 1.5A max.2. 9 light color modes: Red, Blue, Green, Yellow, Purple, Cyan, White, Rainbow, Breathing rainbow, light switch design of the outer circle creates new atmosphere to the car interior space.3. Activate phone voice control like Siri, Bixby, Google Assistant, etc.4. Transmit the music/navigation of your Bluetooth enabled phone to car stereo via FM signal.5. Bluetooth V5.0, auto connect last device.6. Answer hands-free phone calls during driving.7. Transmit the music from U disk (Up to 32G) to car stereo via FM signal.8. Play lossless music from U disk.9. Display car battery voltage while plugged in car charger port. Compatible Devices - iPhone 12 /Pro/Pro Max/Mini/11/XS/XR/X/SE 2020/8 Plus/8/iPad Air 3/iPad Mini 5/iPad 2019/Macbook/Airpods/Huawei, Samsung Galaxy, and newest Lightning devices.