Symphonized MTL Dual Driver Heavy Bass Premium in-Ear Noise Isolating Headphones with Mic Symphonized noise cancelling dual driver headphones produce unique combination of deep bass with clean vocals and clear sound Mtl earphones have dual drivers that produce different pairs of the frequency spectrum Three sizes (s/m/l) of custom silicone ear tips and one convenient carrying pouch Answer or end calls, activate voice control, skip tracks with a smart built-in in-line microphone With the stylish design and high-end sound quality, symphonized earphones are designed for the latest generations of iPod, iPhone and iPad Connectivity technology : Wired