DJI O4 Air Unit Pro Rewiev
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The DJI O4 Air Unit Pro is one of the most exciting FPV product releases of 2025. This camera and video transmitter combo is capable of transmitting and recording HD video that rivals high-end action cameras. By eliminating the need for a separate action camera, the O4 Air Unit Pro reduces weight, lowers cost, and simplifies your FPV drone setup. Here’s an in-depth look at what sets the O4 Pro apart, where it could improve, and how it stacks up against the DJI O3.
Design, Size, and Weight
The O4 Air Unit Pro introduces several design improvements over the O3, including the new heatsink fins to enhance cooling performance.
They’ve returned to the dual antenna design – both antennas are LHCP (left hand circularly polarized).
The O4’s camera is significantly larger than the O3’s, allowing for a larger image sensor.
Despite being slightly larger in overall dimensions than the O3 (32.5 x 30.5 x 14mm vs. O4 Pro’s 33.5 x 33.5 x 13mm), the O4 Pro is notably lighter—about 7 grams less than the O3.
Here’s the dimensions of the O4 Air Unit Pro:
Air Unit Dimensions: 33.5 x 33.5 x 13 mm
Camera Dimensions: 25 x 23 x 20 mm
Antenna Length: 50mm wire + 54mm (3.5mm OD plastic tube)
Camera Wire Length: 130 mm
Flight Controller Cable: 100 mm
Weight: 33g
PICTURE QUALITY
The DJI O4 Pro camera has been improved over the DJI O3, now featuring a larger 1/1.3-inch sensor for improved low-light performance and overall image quality.
One of the standout improvements is the O4 Pro's dynamic range and shadow detail. It captures much more information in darker areas, making it better than the O3 in both daylight and low light. The larger sensor allows the O4 Pro to collect more light, improving clarity and a wider range of height levels, especially in challenging lighting conditions.
For FPV pilots, the live feed you see through the goggles is impressive. The O4 Pro streams 1080p video at 60Mbps to DJI Goggles N3 and Goggles 3 (and 1080p at 50Mbps to Goggles 2 and Integra). It matches the DJI Avata 2 in terms of performance.
Video
The O4 Air Unit Pro supports 4K recording at up to 120fps and offers D-Log M, ideal for color grading after editing. D-Log M provides a flat, neutral-looking video stream, while DJI offers a Glasses Mode that enhances live-view color and contrast for pilots without affecting recorded footage. Very nice.
The recording bitrate is 130Mbps, which is slightly less than the O3's 150Mbps, so for most users the difference is negligible, as platforms like YouTube compress videos to much lower bitrates anyway.
The O4 Pro has 4GB of built-in memory, which is much less than the O3's 20GB. It's only enough to record 4 minutes of 4K 60fps, but it can be a lifesaver if you forget your SD cards, ensuring you don't go home empty-handed. For expanded storage, the device supports microSD cards up to 512 GB.
Range and Penetration
In FCC mode, the output power of DJI O4 Air Unit Pro can reach up to 1200 mW in the 5.8 GHz band, while in CE mode, the maximum power is only 25 mW. However, DJI has introduced an option for CE users to use the 5.2GHz band up to 100mW, but this only works in auto mode. If you manually select 100 mW in manual mode, the power will still default to 25 mW at 5.8 GHz.
DJI claims a maximum transmission range of 15km (FCC) or 8km (CE) with the Goggles 3 and N3.
With Goggles 3, you can now choose 60 MHz bandwidth (60 Mbps bit rate), while Goggles 2 is limited to 40 MHz (50 Mbps bit rate). A wider bandwidth usually results in better range and image quality when flying solo. If you're flying with others, more bandwidth can cause more interference. To reduce this, consider using a lower bandwidth, or even better, race mode.
Power Level Options
The O4 Air Unit allows manual power adjustments, unlike the O3, which automatically manages power levels. The power level options are: Auto, 25mW, 50mW, 100mW, 200mW, 400mW, 700mW, and 1200mW.
FCC Mode: More channels are available, and up to 1200mW output power.
CE Mode: Limited to 25mW on the 5.8GHz band. However, in Auto mode, it can switch to the 5.2GHz band and use 100mW.
Racing Mode
The new racing mode promises to reduce latency to 15ms on the O4 Pro and 20ms on the O4 Lite when used with Goggles 3 (G3) and N3. This could be a game changer for FPV racers or those with less possible latency. Additional benefits include the use of standard Race Band channels and a cleaner transmission, making it ideal for group flights with reduced interference.
Note that Race Mode is only available with Goggles 3 and N3 and is not supported on Goggles 2 or Integra.
Conclusion
The DJI O4 Air Unit Pro sets a new standard for FPV systems by combining superior image quality, versatility and performance. Its larger sensor, improved dynamic range and built-in 4K recording make it a compelling option for casual pilots and professionals alike. The O4 Pro is a solid upgrade from its predecessor, the O3. Whether you're a freestyle enthusiast, a racer, or a cinewhoop maker, the O4 Pro offers features and performance that justify its price. For pilots looking to take their FPV setup to the next level, the O4 Pro is a great choice.
