This car Bluetooth transmitter uses Bluetooth 5.4 to deliver a fast, stable connection with minimal audio quality loss, ensuring uninterrupted calls and music playback. It connects quickly and maintains pairing once paired. - Fast and stable Bluetooth 5.4 connectivity: higher speed, stronger stability, and reduced audio quality loss for calls and music. - Quick pairing: pairing completes in about 1 second; after the initial successful pairing, there is no need to re-pair. - Safe charging when in use: built-in protection includes overcurrent protection, overvoltage protection, smart temperature control, and short-circuit protection to support safe charging of connected devices. - Enhanced audio with EQ: press the EQ button to enjoy strong deep bass and immersive stereo sound. - Easy FM frequency adjustment: open your car’s FM radio, then set the same frequency on the car adapter to align audio output. - Compatibility and purpose: designed to work with Bluetooth enabled devices and connect to your car’s FM radio for in-car audio playback and hands-free use. Use scenarios - Daily commute: pair your phone once, stream music or podcasts, and take hands-free calls with a stable connection. - Weekend road trip: tune the transmitter to a clear FM station, enjoy rich sound with enhanced bass, and keep devices charging during the drive. - Long drives with passengers: multiple Bluetooth devices can connect for music and calls, while the car adapter provides charging for connected devices.