AUXILIARY OUTPUT - This car adapter features a 3.5mm aux output with a 90cm coiled cable. It eliminates the need for FM transmitter adjustments, providing crystal-clear sound quality without any static noise when playing music from your smartphone.HANDS-FREE - The built-in microphone and noise filter IC in this Bluetooth transmitter ensure clearer hands-free calls. It automatically switches from music playback to hands-free mode, providing an optimal call experience while ensuring safety.DUAL USB PORTS - The car charger features two charging ports: a USB-C PD 30W and a USB-A 5V/2.4A, allowing you to charge two devices simultaneously. Additionally, the USB-A port supports USB flash drive playback.STABLE & RELIABLE - Equipped with a Bluetooth 5.4 chip, this car adapter guarantees significantly faster connections and more stable data transmission. The built-in intelligent chip also prevents overcharging, over-current, over-voltage, overheating, and short circuits.AUDIO QUALITY - Experience stable connections with Bluetooth 5.4 and enhanced audio quality with noise reduction technology. The Aux input removes FM transmitter static noise, ensuring high-fidelity sound transmission for music and hands-free calls