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Introducing theĀ ChaddRainsFPV O4/O3 Armer.
If you've ever wanted to add HD FPV to an RC car, boat, plane or anything else without a flight controller, the O4 Armer is exactly what you need!
The DJI O4 or O3 video system will not output its full power unless there is an 'armed' signal sent to it, like you'd get from a flight controller. The O4 Armer sends this 'armed' signal after being powered on for ~20 seconds, automatically.
Just plug in your O4 Air Unit with its stock cable, power the O4 Armer from a 2S-4S LiPo and you're set. There is also a JST-XH connector for a 5V fan to keep your O4 cool, and an optional solder pad which accepts a PWM input, allowing you to turn the O4 Air Unit on/off and toggle low/high power mode.