Evaluation: DJI O4 Air Unit Professional – What You Have to Know Earlier than Shopping for

The DJI O4 Air Unit Professional is without doubt one of the most fun FPV product releases of 2025. This digital camera and video transmitter combo is able to transmitting and recording HD video that rivals high-end motion cameras. By eliminating the necessity for a separate motion digital camera, the O4 Air Unit Professional reduces weight, lowers price, and simplifies your FPV drone setup. Right here’s an in-depth take a look at what units the O4 Professional aside, the place it may enhance, and the way it stacks up towards the DJI O3.

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Prepared to put in and arrange the DJI O4 Air Unit Professional in your FPV drone? Take a look at my full setup information right here: [xxx guide coming soon… stay tuned].

Two Variations

DJI launched the O4 Air Unit in two variations, every catering to totally different FPV drone wants:

1. DJI O4 Air Unit (aka O4 Lite): Compact and budget-friendly, weighing underneath 10 grams.
2. DJI O4 Air Unit Professional (aka O4 Professional): A high-end choice full of superior options.

This evaluate focuses on the O4 Professional. For particulars on the O4 Lite, try my devoted evaluate: [xxx will be published on a later date].

The place to Purchase

You should purchase the DJI O4 Air Unit Professional from the next retailers:

Design, Dimension, and Weight

The O4 Air Unit Professional introduces a number of design enhancements over the O3, together with the brand new heatsink fins to boost cooling efficiency.

They’ve returned to the twin antenna design – each antennas are LHCP (left hand circularly polarized).

The O4’s digital camera is considerably bigger than the O3’s, permitting for a bigger picture sensor.

Regardless of being barely bigger in general dimensions than the O3 (32.5 x 30.5 x 14mm vs. O4 Professional’s 33.5 x 33.5 x 13mm), the O4 Professional is notably lighter—about 7 grams lower than the O3.

Right here’s the size of the O4 Air Unit Professional:

• Air Unit Dimensions: 33.5 x 33.5 x 13 mm
• Digital camera Dimensions: 25 x 23 x 20 mm
• Antenna Size: 50mm wire + 54mm (3.5mm OD plastic tube)
• Digital camera Wire Size: 130 mm
• Flight Controller Cable: 100 mm
• Weight: 33g

O4 vs. O3: Key Variations

Is the O4 higher than the O3? Completely. The O4 outshines the O3 in almost each side.

Right here’s a fast comparability of the important thing options:

Picture High quality

The DJI O4 Professional’s digital camera receives a big improve over DJI O3, now that includes a bigger 1/1.3-inch sensor that enhances low-light efficiency and general picture high quality.

[xxx place holder for side-by-side comparison to the O3]

One of many standout enhancements is the O4 Professional’s dynamic vary and shadow element. It captures much more data in darker areas, making it superior to the O3, Walksnail Moonlight, and even my GoPro Hero 11 in each daylight and low-light situations. The bigger sensor allows the O4 Professional to assemble extra mild, leading to improved readability and a broader vary of brightness ranges, particularly in difficult lighting situations.

For FPV pilots, the stay feed you see within the goggles is spectacular. The O4 Professional streams 1080p video at 60Mbps to the DJI Goggles N3 and Goggles 3 (and 1080p at 50Mbps to Goggles 2 and Integra). This matches the DJI Avata 2 when it comes to efficiency. Within the goggles, I instantly observed enhancements in picture element in comparison with the O3, nonetheless that distinction is smaller than that between the O3 and Vista.

Onboard Recording

Right here’s a pattern footage of the Avata 2 which makes use of the identical digital camera:

The O4 Air Unit Professional helps 4K recording at as much as 120fps and provides D-Log M, excellent for shade grading in put up enhancing. D-Log M ends in a flat, neutral-looking video feed, however DJI provides an in-goggle mode that enhances shade and distinction of the stay view for pilots with out affecting the recorded footage. Very good.

With a recording bitrate of 130Mbps, barely decrease than the O3’s 150Mbps, the distinction is negligible for many customers, as platforms like YouTube compress movies anyway to a lot decrease bitrate.

The O4 Professional consists of 4GB of onboard reminiscence, a lot lower than the O3’s 20GB. It’s solely sufficient to report 4 minutes of 4K 60fps footage, however this generally is a lifesaver whenever you overlook your SD playing cards, making certain you received’t go residence empty handed. For expanded storage, the unit helps microSD playing cards as much as 512GB.

Vary and Penetration

In FCC mode, the DJI O4 Air Unit Professional’s output energy can attain as much as 1200mW on the 5.8GHz band, whereas in CE mode, the utmost is simply 25mW. Nevertheless, DJI has launched the flexibility to make use of the 5.2GHz band at as much as 100mW for CE customers, however this solely works in Auto mode. In the event you manually choose 100mW in handbook mode, the ability will nonetheless default to 25mW on 5.8GHz.

DJI claims the Max Transmission Vary with goggles 3 and N3 is 15km (FCC) or 8km (CE). Nevertheless, I think it’ll exceed that. DJI’s FPV methods are recognized to have a tough vary restrict, which is expounded to software program constraints reasonably than {hardware}. The precise exhausting restrict for the DJI 04 Air Unit is at the moment unknown. For reference, the DJI Avata (V1) utilizing the O3 system is marketed at max 10km vary, however has a real-world exhausting vary cap of 23km. Additional testing is required to substantiate this.

With Goggles 3, now you can choose a 60MHz bandwidth (60Mbps bitrate), whereas Goggles 2 is restricted to 40MHz (50Mbps bitrate). Wider bandwidth usually provides higher vary, penetration, and picture high quality when flying alone. Nevertheless, in my testing, the efficiency distinction between 40MHz and 60MHz is there, however not like night time and day. In the event you’re flying with others, a wider bandwidth may cause extra interference. To reduce this, think about using a decrease bandwidth or, higher but, Race Mode.

Energy Degree Choices

The O4 Air Unit permits handbook energy changes, not like the O3, which robotically manages energy ranges. The ability stage choices are: Auto, 25mW, 50mW, 100mW, 200mW, 400mW, 700mW, and 1200mW.

• FCC Mode: Extra channels can be found, and as much as 1200mW output energy.
• CE Mode: Restricted to 25mW on the 5.8GHz band. Nevertheless, in Auto mode, it may well swap to the 5.2GHz band and use 100mW.

FCC Unlock

You’ll be able to unlock FCC mode on the O4 Air Unit utilizing the identical ham file hack because the O3. This unlock gives extra channels and full energy ranges, supplied you might be flying in a rustic the place FCC operation is authorized.

I’ll present step-by-step directions for enabling this function in my upcoming setup information. Keep tuned! [xxx link to tutorial]

Racing Mode

The brand new Racing Mode guarantees to cut back latency to as little as 15ms on the O4 Professional and 20ms on the O4 Lite when used with Goggles 3 (G3) and N3. This could possibly be a game-changer for FPV racers, or these after the bottom doable latency. Further benefits embody the usage of normal Race Band channels and cleaner transmission, making it excellent for flying in teams with decreased interference.

Notice that Racing Mode is simply accessible with Goggles 3 and N3 and is not supported on Goggles 2 or Integra.

[xxx place folder for image quality comparison]

Latency

The marketed lowest latency for the O4 Professional is as follows:

From my expertise, the latency is similar to, if not higher than, the O3 system and is completely flyable for freestyle. Notice that these latency figures apply to Racing Mode; in Regular Mode, latency is predicted to be larger.

Whereas altering decision has no obvious impact on latency, body charge does. 100fps gives the bottom latency, however it’s only accessible in 1080p. The rating of body charges by latency is:

• 100fps (lowest latency, 1080p solely)
• 50fps (second lowest latency, accessible in any respect resolutions)
• 60fps and 120fps
• 30fps (highest latency)

Video body charge vs. what you might be seeing within the G3, G2 and Integra:

For N3 goggles, the best body charge is 50fps. Whilst you can choose 100fps, the N3 show solely helps as much as 60Hz, which means the body charge will probably be halved (to 50fps) within the goggles, leading to barely larger latency in comparison with 60fps.

Video body charge vs. what you might be seeing within the N3:

Mounting in FPV Drone Body

On the VTX facet, the DJI O4 Air Unit is basically much like the O3, so most frames designed for the O3 also needs to work with the O4. The O4 provides extra mounting flexibility with 20x20mm mounting on one facet and 25.5×25.5mm mounting on either side. That is an improve over the O3, which solely supported 25.5×25.5mm. The O4 additionally makes use of all M2 screw holes as a substitute of the smaller M1.6, making it extra sturdy and user-friendly.

The actual problem lies in becoming the digital camera within the body. The O4 digital camera is considerably bigger than the O3 digital camera, regardless that each have a 20mm width. The O4’s elevated size and “distinctive” screw gap spacing imply that almost all frames designed for the O3 received’t accommodate the O4 digital camera. For some frames, custom-designed 3D-printed mounts could also be required, however for those who’re buying a brand new body for the O4, ensure that it’s appropriate to keep away from surprises.

The O4 digital camera options two M2 screw holes with a 16mm spacing between them, a wierd mounting sample that’s unlikely to work with current frames.

Professional Tip: When mounting the O4 Professional, use spacers underneath the Air Unit to make sure the USB-C port is accessible, because it sits proper on the sting and could possibly be blocked with out correct spacing.

Pinout and Connection

The pinout and wiring for the O4 Air Unit are similar to the O3 (VCC, GND, RX, TX, GND, SBUS), and the enter energy necessities stay the identical. In the event you’re upgrading from the O3, you’ll be able to unplug the O3 and plug within the O4 instantly with out modifying your flight controller wiring.

Moreover, the O4 consists of solder pads for direct soldering, a welcome enchancment for {custom} builds that provides flexibility for non-standard setups.

Digital camera Compatibility

The cameras within the O4 Professional, O4 Lite, and O3 will not be interchangeable. The coaxial cables for the O4 and O3 cameras will not be appropriate. Whereas the O4 Professional and O4 Lite use the identical MIPI connector, connecting the O4 Lite digital camera to the O4 Professional Air Unit (or vice versa) doesn’t work.

Goggles Compatibility

The O4 Professional and O4 Lite Air Items are appropriate with the DJI Goggles 3, Goggles N3, Goggles 2, and Goggles Integra. Nevertheless, there are key variations in performance throughout the goggles:

• Goggles 3 and N3: Help all of the options of the O4 Air Items, though the N3’s show is restricted to 60Hz.
• Goggles 2 and Integra: Restricted to a most bitrate of 50Mbps and don’t help Race Mode.

Regardless of the O4 transmitting solely 50Mbps to the Goggles 2, it performs admirably, providing picture high quality and vary similar to the Goggles 3 with 60Mbps transmission. This makes the Goggles 2 a extra versatile alternative, as they’re appropriate with the DJI O3 in addition to older methods just like the Vista and FPV Air Unit.

Distant Compatibility

The O4 Professional has a built-in radio management hyperlink, permitting it for use with DJI’s remotes with out requiring a third-party radio receiver. The appropriate remotes are:

• RC2: Works with Goggles 2 and Integra solely.
• RC3: Works with Goggles 3 and N3 solely.

Whereas DJI’s remotes are handy, I personally suggest radios from manufacturers like Radiomaster or Jumper, paired with ExpressLRS. These provide superior management precision, higher ergonomics, superior options and efficiency.

Heating Efficiency

Similar to earlier Air Items, the O4 Professional warms up rapidly after energy up. As a security function, when the air unit overheats they have an inclination to change off to keep away from damages. With enough airflow this often shouldn’t be a difficulty.

To this point, I haven’t encountered any overheating points with the O4 Professional, probably due to the chilly winter temperatures the place I stay (5–10°C). The improved heatsink design ought to present enough thermal efficiency in hotter climates, however additional testing in sizzling climate will probably be wanted to substantiate this.

Specs

Right here’s the complete specs of the DJI O4 Air Unit Professional:

• FPV Reside Feed:
  • 1080p 30/48/50/60/100fps
  • 60Mbps on Goggles 3 and N3, 50Mbps on Goggles 2 and Integra
• Lowest Latency:
  • DJI Goggles 3 in Racing Mode: 15ms
  • DJI Goggles N3 in Racing Mode: 19ms
  • DJI Goggles 2 or Goggles Integra: 30ms
• Onboard Recording: As much as 4K 60FPS at 130Mbps, helps D-Log M
• Storage: Constructed-in 4GB + MicroSD Card Slot (as much as 512 GB)
• OSD Help: Betaflight & iNav
• Antenna: Twin Antenna
• Constructed-in Stabilization: RockSteady 3.0
• Digital camera:
  • Picture Sensor: 1/1.3″ CMOS
  • FOV: 155°
  • Aperture: f/2.8
  • Digital camera FOV Mode: Customary, Extensive, Extremely Extensive
• Video Decision:
  • 4K (4:3): 3840 x 2880@30/48/50/60fps
  • 4K (16:9): 3840 x 2160@30/48/50/60/100/120fps
  • 2.7K (4:3): 2888 x 2016@30/48/50/60fps
  • 2.7K (16:9): 2688 x 1512@30/48/50/60/100/120fps
  • 1080P (4:3): 1440 x 1080@30/48/50/60/100/120fps
  • 1080P (16:9): 1920 x 1080@30/48/50/60/100/120fps
• Working Frequency:
  • 5.170-5.250 GHz
  • 5.725-5.850 GHz
• Most RF Output:
• Enter Voltage: 7.4-26.4 V
• Mounting Choices: 20×20mm and 25.5×25.5mm
• Dimensions:
  • Transmission Module: 33.5 × 33.5 × 13 mm (L × W × H)
  • Digital camera Module: 25.55 × 20 × 23.30 mm (L × W × H)
  • Coaxial Cable: 140 mm
  • 3-in-1 Cable: 100 mm
  • Antenna: 110 mm
• Weight:
  • Air Unit (exc. digital camera module): 15.6g
  • Air Unit (inc. digital camera module): 32.0g
  • Antenna: 2.1g every

Energy Consumption

(xxx place holder – Information to be added quickly…)

Can it Substitute GoPro?

For informal FPV pilots, the DJI O4 Professional can completely change a GoPro. The hole in picture high quality between the O4 Professional and high-end motion cameras has narrowed considerably, and the burden financial savings are an enormous bonus. Nevertheless, for skilled work, there are nonetheless benefits to utilizing a separate motion digital camera.

Just like the O3, altering video settings on the O4 impacts what you see within the goggles, together with publicity, body charge, and shade, which may influence your flying expertise. DJI has not too long ago added a mode to the goggles to enhance the look of the video feed when utilizing D-Log M, which is a welcome addition. Additionally, it’s price noting that 10-bit shade continues to be not accessible on the O4.

Bare Model Chance

Taking the O4 Professional aside is surprisingly easy—simply take away 4 M2 screws.

This easy development makes it possible to decase the O4 Professional and switch it right into a “bare” model to save lots of weight, much like the bare O3. Whereas it’ll probably overheat quicker with out the casing appearing as a heatsink, correct airflow would possibly mitigate this situation. We’ll want to attend for somebody to design 3D-printed or CNC spacers to make this mod occur.

If you wish to disconnect the digital camera, or the antennas, that is what you must do.

Downsides

Regardless of its spectacular options, the O4 Professional has a couple of drawbacks:

1. No audio: Neither the stay feed nor the recordings embody audio.
2. Restricted excessive body charge choices: 100fps in 4:3 mode is simply accessible in 1080p. That is disappointing in comparison with the O3, which supported 2.7K at 4:3. Pilots preferring flying in 4:3 mode are pressured to report in 1080p, which looks like a step again.
3. Onboard storage: The O4 Professional consists of solely 4GB of onboard storage, considerably lower than the 23GB accessible on the O4 Lite. Whereas it’s a pleasant backup, it will have been higher to match the Lite’s storage capability.

These shortcomings will not be dealbreakers for many pilots, however they’re price contemplating when deciding whether or not to spend money on the O4 Professional.

Ought to You Improve from the O3?

Regardless that I stated the O4 is general higher than the O3, I don’t suppose there’s an instantaneous have to improve your current O3. The O3 continues to be a incredible Air Unit, the advance within the O4 just isn’t sufficient to justify spending one other $200 on a brand new Air Unit. And in order for you one thing for skilled work, the O4 continues to be not there but to utterly change motion digital camera like a GoPro or Osmo Motion 5. Nevertheless, if you’re shopping for a brand new DJI Air Unit, the O4 is actually the way in which to go.

Ought to You Select the Lite or Professional?

The DJI O4 Lite is small, light-weight, and helps decrease voltages, making it extra appropriate for smaller FPV drones like 3-inch or smaller quads. Nevertheless, in case your major purpose is to seize the highest high quality footage on a small cinewhoop, the O4 Professional is the higher alternative. The extra weight is effectively price it for the improved options and picture high quality.

The O4 Lite has barely larger latency than the Professional, each in Regular mode and even in Race Mode (15ms vs. 20ms). The O4 Professional additionally boasts a wider subject of view, making it higher fitted to picture stabilization, and consists of an SD card slot for storage growth. It additionally helps extra decision choices. If measurement and weight aren’t constraints, the Professional is the clear winner.

However, if weight saving is your precedence, the Lite is a compelling choice because of its compact design and shockingly mild weight.

Ought to You Select the Avata 2 or an FPV Drone with O4?

For superior pilots, the O4 Air Unit Professional is the superior alternative. It provides unmatched flexibility, permitting you to put in it in any FPV drone you need. With no velocity or peak limits, it’s extremely customizable, repairable, and extra highly effective than the Avata 2.

Nevertheless, the Avata 2 is way extra beginner-friendly. It has a a lot decrease studying curve—there’s no want for constructing or soldering. Merely take it out of the field, and also you’re able to fly.

I’ve beforehand in contrast the Avata 2 to a custom-built 5-inch FPV drone, and a lot of the factors stay related: https://oscarliang.com/avata-2-vs-5inch-fpv-drone/.

ND Filter

To realize cinematic footage, ND filter is a should. Discover ways to use ND filter on this tutorial: https://oscarliang.com/nd-filter-fpv/

Current Avata 2 ND filters will match the DJI O4 Professional digital camera. The official ND filters from DJI could be of nice high quality, however they’re fairly costly. These filters can pop off and get misplaced throughout collisions, so choosing extra reasonably priced ND filters could be an excellent choice for these on a funds.

Get it right here:

SD Card Suggestions

SD playing cards will not be included, so listed below are my suggestions: https://oscarliang.com/sd-cards-fpv/#GoPro-DJI-and-Different-HD-Cameras-4K-Movies. When capturing cinematic footage in dangerous places, I all the time convey a couple of SD playing cards with me and swap them out after each flight. This minimizes the danger of dropping all my footage if the drone is misplaced.

Last Ideas

The DJI O4 Air Unit Professional units a brand new normal for FPV methods, combining distinctive picture high quality, versatility, and efficiency. Its bigger sensor, improved dynamic vary, and onboard 4K recording make it a compelling choice for each informal pilots and professionals. Whereas it has some limitations, such because the difficult digital camera mounting, the O4 Professional is a stable improve from its predecessor, the O3. Whether or not you’re a freestyle fanatic, a racer, or a cinewhoop builder, the O4 Professional provides options and efficiency that justify its value. For pilots trying to push their FPV setups to the subsequent stage, the O4 Professional is a superb alternative.

You should purchase the DJI O4 Air Unit Professional from the next retailers:

Edit Historical past

• Nov 2024 – Leaked data revealed.
• Jan 2025 – Up to date with official specs and data