The Sony MDREX37B/RED EX Series In-Ear Headset (Red) pack big audio into a small and affordable form factor. Featuring a colorful design, the headphones can match your outfit or show off your personality. Neodymium drivers provide a wide frequency response with deep bass and clear treble. To ensure the best in-ear fit, 3 different sizes of hybrid silicone eartips are provided. The proper fit maximizes noise isolation and helps to improve bass response. The L-shaped 3.5 mm mini plug is compatible with MP3 players, CD players and other electronic devices.