Bluetooth 5.3 & Aux Adapter Car Bluetooth transmitter utilizes the latest Bluetooth 5.3 technology for fast, stable connections and uninterrupted calls and music. Its powerful memory function will auto-connect the last connected device when turned on the next time. You can also use the included Aux cable to connect the transmitter directly for pure sound quality (no need to pair it with FM).PD 30W & QC 18W Fast Charging The car charger adapter features a 30W Type-C port and a QC3.0 18W USB port, allowing simultaneous charging of two devices with automatic allocation of optimal charging efficiency. It intelligently recognizes and charges for Android or iPhone devices and comes equipped with over-current protection to ensure safe charging.Enjoy Hands-free Calls Fully liberates your hands, our car phone charger allows for hands-free calls with just a button, answer/redial/hang up or reject calls all in one multifunction button. With a simple one-button control, you can free your hands for a safer and more comfortable experience.Deep Bass & Voice Assistant By simply pressing the 'B' button on the FM Bluetooth transmitter car, you can enjoy powerful deep bass and stereo sound. It enables the activation of Siri voice assistant with a long press of the 'B' button. Making it much more convenient and efficient to use without having to hold your phone.The Utmost Driving Experience This aux Bluetooth adapter for car is easy to attach to the car's air vent, placing it within your line of sight. Compatible with 12V-24V cars, insert this car Bluetooth aux adapter into the cigarette lighter socket, it will display your car's voltage within 3 seconds. It also comes with a clear LED digital display and adjustable colored ambient lights, creating a comfortable and romantic atmosphere inside your car.