Two Mode of Transmitting Receiving: The small Bluetooth aux adapter for car is not only a Bluetooth 5.0 receiver, but also a Bluetooth transmitter. And you can slide the right button to easily switch the mode. The 2-in-1 wireless Bluetooth transmitter receiver can be used as a receiver in car audio systems, home stereo speaker, wired headsets, and as a transmitter when used in a TV or computer, which makes your life more intelligent | Wireless Bluetooth 5.0 and Wide Compatibility: The portable aux Bluetooth adapter for car can turns your favorite old non-Bluetooth device into a modern wireless Bluetooth device. And it adopt the latest Bluetooth 5.0 technology for ultra-stable connection with low power consumption and high rate for smooth listening and conversation. Moreover, mini car Bluetooth adapter can be compatible with most Bluetooth-enabled devices and all Bluetooth versions | Built-in Mic and Hands-free Calling: The wireless Bluetooth receiver for car has a built-in microphone, so you can make hands-free call with it. And you just need to press the button, then answer,cancel or end the call easily, which make your drive safely and convenient. Besides, you can listen to dynamic music with a smart Bluetooth car adapter, your journey is no longer lonely | Fast Charging and Long Battery Life: Fast charging mode, the aux Bluetooth adapter for speaker can be fully charged within 1 hour, save your waiting time, and it also can be used while charging. In addition, the built-in 150mAh rechargeable lithium battery has a long battery life and can support up to 4-8 hours of use after a full charge. In addition, the Bluetooth transmitter aux adapter can effectively transmit up to 20 meters without any obstruction | 12 Month Warranty and Lifetime Technical Support: We have confidence in the quality of bluetooth car adapter aux input, in the case of non-human damage, we provide a 12-month replacement warranty. In addition, we provide lifelong technical support. If you have any questions, please let us know, our professional service team will provide you with the best support services