Advanced music technology: The BT car adapter automatically identifies music files of various TF card brands and provides perfect audio performance to enhance the driving experience. Enjoy plug-and-play convenience and superior sound quality. ADJUSTABLE FREQUENCY: Tell you the included wire and enjoy wireless music streaming with the Blue Tooth Car Adapter. All car stereo systems can be easily converted to Blue Tooth speakers by tuning at any frequency from 87.5 ~ 108MHz. Hands-Free Calls: The Blue Tooth car adapter features a built-in microphone and hands-free speakerphone for clear calls. Keep your hand on the handle and press the button to answer or reject calls, making dialing simple and safe even on the road. Improved Connectivity: Made with advanced Blue Tooth 5.3 technology, this car adapter ensures faster transfer speeds, clearer sound quality, performance and seamless compatibility with mobile phones. Allowing you to enjoy uninterrupted music and hands-free calls in the car. No-charging design: This BT car adapter simply plugs into your car's integrated card slot to enjoy wireless music and hands-free calls. Charging is hassle-free and requires no wiring.