DJI O4 Air Unit: setup, range and compatible goggles

The DJI O4 Air Unit is DJI's digital FPV video system for custom quads. It works with DJI Goggles 3 or Goggles N3 plus the FPV Remote Controller 3, and with Goggles 2 or Goggles Integra plus the FPV Remote Controller 2. It weighs about 8.2 g with its camera, records 4K/60 to 23 GB of built-in storage, and reaches up to 10 km (FCC) with Goggles 3 or N3. Third-party goggles aren't supported.

O4 Air Unit or O4 Air Unit Pro?

DJI pitches the standard O4 at 2-inch and smaller frames, cinewhoops and racing practice. Its transmission module is 30 × 30 mm and 6 mm tall. DJI pitches the Pro at 3-inch and larger frames, where you want 4K/120, 10-bit D-Log M and a 155° lens. If you fly a tiny whoop, the Pro's 32 g matters a lot; on a 5-inch it hardly does.

Compatible goggles and controllers

Goggles	Controller	Notes
DJI Goggles 3	FPV Remote Controller 3	Lowest latency, racing mode
DJI Goggles N3	FPV Remote Controller 3	Racing mode supported
Goggles 2, Goggles Integra	FPV Remote Controller 2	Under 35 ms latency

You can also fly with your own radio and receiver. To use a DJI FPV controller, set the flight controller to SBUS. DJI lists Betaflight 4.3.0 or later and INAV 8.0.1 or later.

O3 Air Unit owners: Goggles 3 support the O3 too, but the O4 isn't a drop-in swap. DJI says the O4's modules are a different size, and only the 3-in-1 cable is shared with the O3 (the O4 Pro also shares the antenna). Full chart: DJI goggles compatibility.

Setup in five steps

1. Wire it. Power (3.7 to 13.2 V on the standard O4), ground, and UART: air unit RX to flight controller TX, air unit TX to FC RX. See build an FPV drone.
2. Activate it. Connect the air unit to a computer by USB-C, open DJI Assistant 2 (Consumer Drones Series) and log in. Until it's activated, transmit power is limited to 20 mW or less and the goggles menu won't work.
3. Update firmware for the air unit, goggles and controller in DJI Assistant 2.
4. Link. In the goggles menu, select the product under Status. Press the air unit's link button (its LED blinks red), then the goggles' link button. Solid green means linked.
5. Link the controller to the goggles the same way, then set up OSD in Betaflight.

Range, latency and power

• Range: 10 km FCC with Goggles 3 or N3, measured in an open area with no interference. Your battery will run out long before that on a small quad.
• Latency: as low as 20 ms with Goggles 3 and 24 ms with N3 in racing mode (1080p/100fps), and under 35 ms with Goggles 2 or Integra.
• Transmit power: up to 700 mW on the standard O4, set in the goggles under Transmission. Available levels vary by region.

Common O4 problems

• Hot on the bench, video drops. The O4 goes into low-power mode on the ground and can overheat without airflow. Take off promptly or add a fan when testing.
• Video but no OSD. Check the channel setting and that OSD is enabled, and that your flight controller firmware supports DJI's Canvas mode.
• Won't link. Update every device first. DJI says devices on old firmware may not link.
• Weak signal. Make sure it's activated (20 mW cap otherwise) and the antenna isn't blocked or twisted.
• Wobbly stabilized footage. DJI notes motor vibration can resonate with the camera's IMU. Soft-mount the camera or use a TPU mount.

Rules for custom FPV builds

A build under 250 g flown for fun doesn't need FAA registration. Over 250 g, register it and add Remote ID. With goggles on you need a visual observer beside you. Read are FPV drones legal and FAA registration.

Ready to build? Pair the DJI O4 Air Unit with DJI Goggles 3, or browse FPV goggles.

Related guides

• DJI Goggles 3 OSD setup with Betaflight and the O4 Air Unit
• DJI Goggles 3 antennas and range: FCC mode, upgrades and extenders
• DJI Goggles 3 head tracking: setup and fixes
• DJI O4 video transmission explained: range, latency and frequencies
• DJI Goggles 3 and Goggles N3 compatibility: which drones work?
• Do DJI Goggles 3 work with analog FPV?

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