The SC1 is a TRRS extension cable designed specifically for use with TRRS microphones, such as the SmartLav+.
If you're using a TRS Lavalier microphone, like the Lavalier II, you can extend the overall cable length by using the SC4 cable (TRS to TRRS) in conjunction with the SC1. This combination allows you to connect and extend the cable length for your TRS Lavalier microphone setup.