Essager EB01 Series Add Bluetooth to Your Car: Instantly upgrade your traditional car or old-fashioned speakers by connecting to the AUX input, giving them Bluetooth capability Support Hands-free Calling: With advanced noise-canceling technology, enjoy clear echo-free hands-free calls while keeping both hands on the wheel for safer driving Bluetooth 5.0 Chip: Equipped with a high-performance Bluetooth 5.0 chip. Providing stable and smooth signal transmission for uninterrupted music, calls, and navigation High-Fidelity Transmission: Designed with anti-interference circuitry and enameled copper wire core, effectively isolating noise and electrical "squeaking" sounds Secure Connection: High-quality 3.5mm plug, snugly fits the interface, resilient to frequent plugging and securely fastened TPE Spring Wire: Expands freely from 0.35 to 1.1 meters, tangle-free and easy to store, making it more convenient to use Plug and Play: Simply plug it into the 3.5mm Aux jack and power it directly via USB port, eliminating concerns about low battery and battery lifespan Music Freedom: Effortlessly turn your traditional wired speakers into wireless ones with Bluetooth adaptation, allowing you to enjoy music anytime, anywhere