Stereo Inside The Ear Headphones Built In Hands Free Microphone Black With Crystal Clear Sound Compatible Motorola Droid Razr Maxx 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 Motorola Droid Razr Maxx Some states requires a hands free device for using the phone while driving