1. With its ergonomic design, perfectly fit your ear, it is firm to wear, and not easy to be shaken off. 2. Universal 3.5mm audio plug, with angled design, compatible with almost all audio devices with 3.5mm audio jack. 3. Built-in 14.2mm drive unit, brings you good surrounding sound, clear and vivid bass effect, allowing you to have a good listening experience. 4. The length of the wire is 1.2m, with TPE shell outside, not easy to knot and tangle-free. 5. Great for running, hiking, cycling, car driving, business occasion, etc, enjoy superb sound quality instantly. 6. Specification: - Drive unit diameter: 14.2mm - Frequency range: 20Hz-20KHz - Rated power: 3mW - Cable length: 1.2m - Material: TPE+ABS+metal - Plug type: 3.5mm AUX plug