Cresyn C750E Sound- Isolating In-Ear Headphone Earbuds with Micro Max Transducer For Superior Sound (Black) Perfect companion for your iPod, MP3 player, laptop, portable DVD player, MD player, Radio, and other audio devices. Fashionable and unique design provides you with high-intensity listening experience with crisp and clear sound. Soft silicone ear buds provide a super comfortable, noise reducing fit. Three different sized earbuds (S,M,L) included to insure the perfect fit. 3.9 feet of tangle-free cord is easily stores away in included carrying pouch for convenient storage. Technical Details Type: Open Air, dynamic Driver Units:  16 mm Frequency Range: 12 - 22,000 Hz Impedance: 32  Sensitivity: 98 dB/mW