The design of the Epic Earbuds is defined by the geometry of the ear. More comfortable for more people than any other earbud-style headphone. The speakers inside Epic Earbuds have been engineered to minimize sound loss and maximize sound output. you get high-quality audio with deep bass that is just as impressive as what you'd hear from more expensive headphones. Volume control only work with iPhone, headset & microphone compatible with all smart phone. 3.02" L x 1.71" L x 1.05" H