The BOYA BY-LM20 Lavalier Clip-on Omnidirectional Condenser Microphone is designed for video use and provides clear and accurate voice reproduction. Newscaster-style design provides effective omni-directional pickup pattern. This is the best performance+cost value available for your complete video needs.Unit is extremely lightweight, it is designed for optimum portability and comfort, and delivers some of the clearest recorded sound you can find. The BOYA BY-LM20 Lavalier Clip-on Omnidirectional Condenser Microphone is compatible with the Hero4, HERO3 & HERO3+. Microphone performance is much better than most built-in camera microphones: outstanding for interviews, podcasts, dictation, and much more. This microphone is a workhorse, never get caught with mushy, muffled sound again.