This USB programmer allows you to connect your PC to the Rotogeeks ESCs (12A v3/v4 and 30A v2) and run BLHelisuite to configure and flash the ESCs. Please note this is a PC tool. We have one user who has succesfully run it on a Mac using VMWare Fusion XP (thanks Justin!)
This connects via the C2 interface, not the signal leads. It can be used to recover ESCs corrupted while flashing with the bootloader.