Bluetooth 5.0 technology: Car Bluetooth transmitter uses advanced Bluetooth 5.0 technology to provide a more stable connection, with faster transmission and lower latency. Hands-free calling: The built-in high-performance microphone quality can realize hands-free calls or clear voice navigation and provide you with crystal clear call sound. This aux Bluetooth adapter ensures safe driving while allowing you to talk worry-free. Plug and Play: Without battery, this Bluetooth aux adapter with a USB port for power supply. And the 3.5mm auxiliary port is for connecting non-Bluetooth devices. Direct connection, easy to use. Durable and portable: The Bluetooth car audio adapter is made of zinc alloy, which improves the durability of the 3.5mm Bluetooth adapter. With premium 0.35-1.1m TPE elastic cable, the car USB Bluetooth adapter will meet your needs in different occasions. Quick pairing and automatic reconnection: after starting the Bluetooth 5.0aux receiver, search the name for quick pairing with your phone. After the device is successfully connected to Bluetooth, the blue light will flash slowly. The next time you use it, the Bluetooth adapter will automatically connect to your phone.