The RODE SC3 is a 6.7" adapter cable with a 3.5mm TRRS female connector on one end and a 3.5mm TRS male connector on the other. It is designed specifically for accepting a smart lav and connecting it to a camera or audio recorder. It pairs really well with the RODE smartLav+ for when you want to use that smart lav with your camera or recorder rather than your smartphone. It is also handy for adapting a smart lav to a wireless system like the RODE Wireless GO II.