ifrogz Earpollution D-33 earbuds are not only noise isolating headphones, but also offer a snug secure fit and rich deep sound. 2 in-ear earbuds deliver rich bass and clean sound. Includes earpieces in 3 different sizes and a convenient travel case. The metallic colors and PVC Radioactive patch are stylish and easily recognized as part of the ifrogz family. Suitable for all MP3 and media players with standard 3.5mm earphone / headphone jack. ifrogz Earpollution D-33 Earbuds key specifications:Driver Size: 9 mmMagnet Type: 3.5 x 1.5 mm NdFeBFrequency Range: 30 Hz - 20 KHzImpedance: 16 ohms +/-15%Max Input Power: 10 mWOutput Sensitivity: 96 db +/- 3 db at 1 KHzStandard 3.5mm headphone plugPackage contents:1 set of earbuds (1m. cord with asymmetrical cable) 3 ear fit pieces convenient travel case