Product Details: Name: Car Bluetooth Adapter Car Charger Music Player Automotive Electronic Accessories Fast Charging Key Features: LED Light: The LED lighting system comes in a variety of colors as well as flashing modes. This feature provides a customizable and visually attractive aesthetic to your car interior. If you prefer a softer look, you can turn off the light. PD 20W and QC 18W Fast Charging: You can charge up to three devices simultaneously while listening to music, which is a practical choice for those who often need to power smartphones, tablets or other gadgets in the car. 3 Music Playback Modes: This versatility allows you to play music from different sources according to your preferences and available devices. However, it is recommended that users select blank stations to avoid interference and ensure clearer sound. Bluetooth: More stable pairing with your phone or other Bluetooth-enabled devices ensures smoother music streaming and hands-free calls. Universal Compatibility: This Bluetooth FM transmitter is compatible with any 12V-24V vehicle, suitable for cars, trucks and SUVs. Potential issues to note: Signal interference: Although the product recommends choosing a blank station to avoid signal interference, interference may still occur in some areas with crowded radio frequencies. Battery voltage display: If your old car has electrical system problems, the voltage monitoring function may become a problem. In some cases, inaccurate readings may cause confusion, so make sure the device is installed and calibrated correctly. Product includes: 1* Car Bluetooth Adapter Note: Please allow slight size errors (1~2cm/0.39~0.78inch) due to manual measurement, which is subject to the actual received; please allow slight errors in color under different monitors.