Koss P9 In-Ear Headphones with Volume Control (Discontinued by Manufacturer) Behind The Head, Side Firing Design In Line Volume Control Side Firing Design Aims Earbuds Sideways Into Ear Canal, Enhancing Sound Quality Eliminates The Need For Conventional Headbands Lightweight & Comfortable For Long Listening Frequency response 40-20,000 Hz Electro Dynamic Element Lightweight Earbud for Portable, Active use Side Firing design for Improved Bass Volume Control on Cord for Easy Level Adjustment