The Replay XD XD1080 external microphone is a miniature lavalier microphone with omni-directional condenser. The microphone itself has been developed for use in a variety of applications. The frequency and sensitivity was developed to accurately reproduce the sound character of your work with fine detail and minimal noise. External Replay XD XD1080 audio adapter is a rugged screw adapter, which is screwed onto the back of your Replay XD XD1080 camera and so the camera is protected from dirt. The 3.5 mm jack allows you to connect an external microphone or other line-in audio source.