Features: 0.3-1.2 meters of spring wire, the wire is made of high resilience TPE material, which can be stretched freely without deformation, anti-winding and not messy, convenient for storage and use. Gold-plated 3.5mm plug + enameled copper wire core, not afraid of oxidation, but also improve the sound quality. Remember the connection, after the first connection, the next for time it is turned on, it will be automatically paired and connected. Support hands-free calls, release your hands to make driving safer. Built-in high-definition noise reduction microphone, incoming calls are clear and echo-free. The anti-current interference circuit design effectively isolates the squeak caused by the current, making the sound quality more pure. The barrier-free linear transmission is 10 meters. The signal transmission through the AUX port connection is more stable, faster, and the Bluetooth-compatible connection is simpler. USB is directly powered, so there is no need to worry about insufficient power and battery life. brand new and high quality Bluetooth-compatible 5.1 version, compatibility, stability, and response speed are better than the previous version.The 3.5mm jack can be connected to non-Bluetooth car and audio equipment such as sound effects through the AUX interface to make it have Bluetooth-compatible function. Specifications: Product name: Bluetooth-compatible audio receiver Output interface: 3.5mm/USB Bluetooth-compatible version: 5.1 Transmission distance: 10 meters without barriers Line length: unstretched 30cm/11.81in, stretched 120cm/47.24in Note: Due to the monitor difference and light effect, the actual color of the item may be slightly different from the color shown on the pictures. Thanks! Please allow 1-2cm measuring deviation due to manual measurement. Package includes: 1 x Audio Transmitter Receiver