DJI O4 Air Unit Series
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DJI O4 Air Unit Series: HD Digital Video Transmission for Custom FPV Builds
The DJI O4 Air Unit Series brings DJI's O4 transmission system to self-built FPV drones, replacing analogue video with an HD digital feed. Two units cover the range: the O4 Air Unit at 8.2 grams for lightweight and micro builds, and the O4 Air Unit Pro with a larger sensor, dual antennas, and 15km range for performance builds.
Both deliver 1080p/100fps live view with latency as low as 20ms, and a dedicated Racing Mode drops that to 15ms while supporting up to eight aircraft flying simultaneously.
Which O4 Air Unit Do You Need?
| Product | Sensor | Video | FOV | Range | Price |
|---|---|---|---|---|---|
| O4 Air Unit | 1/2-inch CMOS, 12MP | 4K/60fps | 117.6° | 10km | £99.00 |
| O4 Air Unit Pro | 1/1.3-inch CMOS, 12MP | 4K/120fps | 155° | 15km | £209.00 |
Not sure which fits your frame or build goals? Call 01243 859444 and our team will talk it through.
DJI O4 Air Unit: Lightweight Digital Transmission
At 8.2 grams and measuring 30 x 30 x 6mm, the O4 Air Unit fits builds where every gram counts, including 2-inch frames and smaller. The 30 x 30mm mounting hole pattern matches standard stack spacing, so it drops into most existing builds without modification.
A 1/2-inch CMOS sensor records 4K/60fps video at 12MP, across a 117.6° field of view. A single-antenna design keeps weight down while still delivering 10km maximum transmission range and a 60Mbps maximum bitrate.
23GB of built-in storage handles onboard recording, though note that microSD is not supported, so plan your footage offloading around the internal capacity.
DJI O4 Air Unit Pro: Larger Sensor, Longer Range
The O4 Air Unit Pro steps up to a 1/1.3-inch CMOS sensor recording 4K/120fps, giving both better low-light performance and genuine slow-motion capability in post. A 155° ultra-wide field of view produces the expansive, fast-feeling perspective FPV footage is known for.
10-bit D-Log M colour recording widens the margin for grading in post-production, useful for anyone cutting FPV footage into a broader edit. A dual-antenna design extends maximum transmission distance to 15km, with the system automatically switching to the most stable frequency.
Racing Mode: 15ms Latency, Eight Aircraft
Racing Mode fixes recording and transmission at 1080p/100fps and drops video latency to 15ms, the point at which control feels immediate rather than delayed. It supports up to eight aircraft racing simultaneously, and sets the channel to manual mode with Race Band frequency points compatible with analogue video transmission.
When flying alongside analogue racers, keep goggles at least one metre apart, select frequencies manually, and adjust transmission power to suit. Racing Mode requires DJI Goggles 3 or DJI Goggles N3.
Compatibility
The O4 Air Unit Series works with:
- Pair with DJI Goggles 3 or DJI Goggles N3, alongside the DJI FPV Remote Controller 3, for the current-generation setup
- Connect to DJI Goggles 2 or DJI Goggles Integra with the DJI FPV Remote Controller 2, retaining use of existing kit
- Customise your OSD through Canvas Mode and Betaflight OSD settings, adjusting real-time data and layout to suit your flying
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