54W High Power Fast Charging, 4-Port Synchronous Charging: Bluetooth car adapter integrates PD36W and QC18W, offering a high-speed and efficient charging solution. Its innovative four-port design supports parallel charging of multiple devices, effortlessly overcoming battery anxiety and enhancing charging efficiency.Technological Leadership, Revolutionary Bluetooth 5.3: The iphone fm transmitter for car radio uses the latest Bluetooth 5.3 technology, significantly improving connection speed and data transmission efficiency. Enhanced sound quality ensures rapid and stable connections, providing a clearer, smoother experience for both calls and music playback.Stunning Bass, Colorful Lighting Effects: One-touch activation of stunning bass effects reproduces the true texture of music, offering an unparalleled musical experience. The five-color lighting design provides accurate perception at night, ensuring easy and safe operation, making nighttime driving more relaxed.Voice Commands and Precise Touch Control: Our bluetooth cigarette lighter adapter supports smart voice navigation from your phone for truly hands-free driving. Its unique raised button design provides precise, sightless control, ensuring safety and convenience while driving.Comprehensive Safety Assurance and Wide Compatibility: FM modulator bluetooth for car provides all-around safety protection, including over-current, over-voltage, overheating, and short-circuit protection, ensuring the safety of you and your devices. Its wide compatibility supports 12V to 24V vehicle voltages, suitable for most cars. Continues to innovate, offering industry-leading car Bluetooth adapter that ensure safety and compatibility. (Please compare the size between the transmitter and your car cigarette lighter )Kindly Note: It's compatible with car cigarette lighter socket dimensions: Diameter without spring clip: 20mm, with spring clip: 24mm (Please make sure the diameter of our transmitter matches the diameter of your car cigarette lighter socket). Before plugging into the car cigarette lighter socket, please check whether there is any foreign matter at the bottom of the cigarette lighter socket and make sure the inside of the car cigarette lighter socket is clean.How to Match & Switch Frequencies: First, power on your car radio, tune it to a blank FM frequency. (An blank frequency is a channel with no active radio programs broadcasting on it, producing only a slight rustling or static noise through car's speaker). Set the NX16 to the same frequency as the car radio. Switch frequency: Long press the rotate button of NX16 until the frequency starts flashing, rotate the button clockwise to increase frequency. Otherwise, decrease frequency.Pair the FM Transmitter with Your Smartphone via Bluetooth: Enable your phone's Bluetooth is turned on, search for 'NX16', then select 'connect'. Once connected successfully, you can start playing music, using navigation, or enjoying hands-free calling through the device.