1. Adjustable earhooks is easy to clip on your ear, then keep the headphone securely in place during sports & rigorous activity.
2. Silicone earplugs, comforms to your ear. These are 3 sizes of earplugs to ensure a custom comfortable fit, sealing the ear to deliver bass and isolate noises.
3. Good sound quality: good call quality and microphone. Even on a noisy treadmill, you can clearly hear each other.
4. Built-in microphone, can answer / hang up calls and switch music
5. Suitable for all kinds of sports occasions, such as running, jogging, hiking, cycling, etc
6. 3.5mm headphone jack
7. Frequency range: 20-20KHz
8. Sensitivity: 97dB+/-3dB
9. Impedance: 16+/-15% ohm
10. Line length: 120+/-5cm