These cables serve 2 purposes:
1. Power your goggles from a battery in your pocket. They will work with any battery 3S - 6S, and provide clean 8V to your goggles
2. Power your Fatshark Fan with 11.5V.
Did you know your fatshark fan is a 12V fan? But we just power it with 2S lipo voltage all the time. Feeding it 11.5V will clear fog and sweat MUCH quicker, and keep that air flowing. If you don't want 11.5V all the time, you can install the fan mod available here:
They are available with a few different color and LED position variants, if you don't contact us before or soon after ordering, we'll just send you the latest & greatest version. If you want something specific, please let us know.