Frequency Response: These earbuds provide a wide 16-20,000 Hz frequency response for crisp, clear sound. Impedance: With 16 ohm impedance, these earbuds deliver powerful sound while staying comfortable to wear. Adjustable Design: The soft rubber ear clips adjust to fit securely and comfortably in 5 different positions. Built-in Microphone: The earbuds have a built-in microphone for hands-free calling and voice access. Frequency Response - 16-20,000Hz Impedance - 16ohms