Philips SHE2100WT/28 In-Ear Headphones - White 15mm Speaker Driver: Small enough for optimum wearing comfort and big enough to deliver crisp, non-distorted sound, the 15mm speaker driver is an ideal size for listening enjoyment. Bass Beat Vents: Bass beat vents allow air movement for better sound with a deep rich bass. Neodymium Magnet: Neodynium is the best material for producing a strong magnetic field for greater sensitivity in a voice coil, better bass response and higher overall sound quality. Slim Cap Earbud Design: Slim cap is ergonomically designed according to the anatomy of the human ear canal. It fits in the ear securely and comfortablye for earbud lovers. Connectivity Technology: Wired