[Simple Operation] The USB port is connected to the car's USB port for power supply, and the 3.5MM port is connected to the car's AUX hole. After the USB is powered, the green light flashes quickly. After the mobile phone Bluetooth (YP04) is successfully connected, the green light flashes slowly, and aux bluetooth adapter for car can be used normally | [Bluetooth 5.3 Stable Connection] Bluetooth 5.3 master control, stable signal transmission, no delay and no lag. You can enjoy uninterrupted music streaming with this 3.5mm bluetooth adapter. The built-in antenna design enables long-distance transmission of 0-10 meters | [High Quality Guaranteed] Using enameled copper wire core, high-fidelity transmission, no noise, no current sound, allowing you to enjoy a high-quality audio experience. Aux to bluetooth adapter supports music, hands-free calling, voice navigation and more | [Dual Connection Automatic Reconnection] Car bluetooth transmitter Supports 1 drag and 2, connect 2 mobile phones at the same time and switch between the two mobile phones at will, share the music of the two mobile phones, and switch between the two devices at will. Auto-reconnect helps you automatically connect to your phone when you return to your car | [Portable Exquisite Design] The braided high-quality spring wire can be stretched at will, with a natural length of 20 inches and a stretched length of 40 inches to meet your needs in different occasions. The rope segments are free of knots and tangles and are neat and orderly. Bluetooth receiver compact and portable design makes it perfect for travel, and its zinc alloy casing ensures it's durable and long-lasting