Stereo Inside The Ear Headphones Built In Hands Free Microphone Black With Crystal Clear Sound Compatible HTC EVO 4G LTE Provides a comfortable conversation while keeping your hands free. Dynamic Driver Technology Provides Undistorted Crisp and Clear Audio Microphone is attached to the wire Fits the 3.5mm jack in your HTC EVO 4G LTE Some states requires a hands free device for using the phone while driving