Universal Compatibility: Perfectly connects with smartphones, tablets, laptops, and other devices with a 3.5mm audio jack, ensuring seamless transmission of stereo audio for high-quality sound. Flexible Spring Design: The innovative spring mechanism prevents tangling and provides extra durability, making it ideal for everyday use and storage. High-Quality Sound: Experience , crystal-clear audio with no interference or noise, thanks to the high-quality materials and advanced technology used in these aux cables. Construction: Built to last with robust materials that withstand frequent plugging and unplugging, ensuring long-term usability and reliability. Portable and : Easily carry your audio cable , perfect for travel, home, or office use, enhancing your audio experience wherever you are. The 3.5mm interface is widely compatible. Input: USB 5V Audio output: 3.5mmAUX Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:Black Material:Metal Package Contents: 1 x Bluetooth Audio Receiver Dongle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.