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 also used to recover ESCs corrupted while flashing with the bootloader - something you can't do with a control board!