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Elevate your workout listening to your music with SonyActive Sports Headphones. You've got the right shoes and workout gear; now take your music to the next level with the MDR-AS400EX headphones. The highefficiency, 9mm drivers units deliver extended frequency response and powerful bass while the hybrid silicone ear buds and adjustable ear loop ensurea secure fit. 9mm Drivers. Water-Resistant, Sweat-Proof Design. Adjustable Ear Loops. Serrated Cable. Includes 4 Pairs of Hybrid Ear Pieces. Includes Clip and Cable Length Adjuster. Includes Carry Pouch. Cord Length: 3.94 ft; Frequency Response: 4-24,000Hz, 4–24,000Hz; Cord Type: Y type, flat cord