Sony MDR-G57G S2 Sports Street Style Headphones with Reflective Ear Piece (Discontinued by Manufacturer) Sports Concept Behind-The-Neck Band Reflective Ear Piece Water Resistant 30Mm Ferrite Magnet Frequence Response: 16 Hz-20 Khz. Connectivity Technology: Wired Behind-the-neck sports headphones are non-slip Reflective ear piece; water resistant 30 mm diameter driver for delivery of deep bass Acoustic Turbo circuitry for quality sound delivery Features Sony's acoustic twin turbo circuit for improved efficiency