The Replay XD XD720 External Microphone is a miniature lavalier microphone with an omni-directional condenser, The microphone itself is engineered for use in a wide array of applications, The frequency and sensitivity response is designed to accurately reproduce the audio character of your activity with great detail and minimal noise, The Replay XD XD720 External Audio Adapter is a rugged screw-on adapter that keeps the back of your camera sealed from the elements, It features an aluminum knurled bezel that is easy to attach, The 3, 5mm mini jack has a nice positive detent to keep your microphone or other line-in audio source securely attached, SKU: RLYX042