The SJCAM POWER SUPPLY + EXTERNAL MICROPHONE is a USB-C extension cable that allows you to connect your charger and microphone to your SJCAM at once. If you're an action camera enthusiast, you know the importance of having the right gear to capture all the adrenaline-pumping moments. One of the most crucial accessories for your action camera is an extension cable with charging and microphone slots. This cable allows you to charge your camera while still recording, and it also enables you to use an external microphone for better audio quality.