Nike SHJ080 Sport Skylon Earhook Headphones (Gray) (Discontinued by Manufacturer) Features Sportsound With Turbo Bass Sweat-Resistant Lightweight With Tough Metal-Alloy Body Secure Grip With 3-Way Adjustability Frequency response: 8-24 000 Hz Impedance: 16 ohms; sensitivity: 104dB Maximum power input: 50mW Neodymium magnet Earhook design adjustable in 3 different ways