DJI O4 Air Unit | 4K 60fps Digital HD FPV | The FPV Project

The DJI O4 Air Unit is the world’s smallest and lightest 4K digital FPV video transmission system, weighing just 8.2 grams with the camera module included. Released in January 2025, it brings DJI’s O4 transmission technology into an ultra-compact 30x30mm package — compatible with frames as small as 2 inches, and capable of recording 4K/60fps footage while transmitting a live 1080p/100fps feed with latency as low as 20ms.

Why choose the DJI O4 Air Unit?

The O4 Air Unit fills a specific gap in the DJI lineup — pilots who want genuine 4K recording and DJI’s transmission reliability in the smallest possible package. At 8.2g it’s lighter than any competing digital FPV system at this quality level, and its 30x30mm transmission module fits cleanly into most 3-5 inch freestyle and cinewhoop builds without modification. Pair it with components from our AIO flight controller range for a complete digital FPV build.

Note: This listing is for the standard DJI O4 Air Unit only — not the O4 Air Unit Pro.

Key features

4K/60fps recording with 1/2-inch CMOS sensor

Records up to 4K/60fps locally and streams a live 1080p/100fps feed to your goggles via H.265 encoding — delivering crisp, smooth footage even at high flight speeds. The 1/2-inch sensor provides strong dynamic range for outdoor cinematic and freestyle flying.

10km transmission range with 20ms latency

Up to 10km maximum transmission range under FCC standards, with latency as low as 20ms in Racing Mode when paired with DJI Goggles 3 or N3. Auto frequency selection maintains the most stable channel across 5.1GHz and 5.8GHz bands.

Racing Mode — up to 8 pilots simultaneously

The new Racing Mode supports up to 8 aircraft racing simultaneously, each maintaining low-latency transmission — ideal for organised FPV racing events.

Betaflight OSD and Canvas Mode

Full Betaflight OSD support and Canvas Mode (compatible with Betaflight Configurator 4.3.0+) allow complete customisation of on-screen flight data displayed in your goggles.

RockSteady stabilisation

Built-in RockSteady electronic stabilisation keeps footage smooth during high-speed manoeuvres. Also compatible with Gyroflow software for offline post-stabilisation.

Ultra-compact — fits 2-inch frames

The transmission module measures just 30x30x6mm, and the camera module 13.44×12.36×16.50mm — small enough to fit frames as small as 2 inches, making it one of the most versatile digital FPV systems available.

Goggle compatibility

Specifications

What’s in the box

• 1x DJI O4 Air Unit transmission module
• 1x DJI O4 camera module
• 1x 3-in-1 cable (50mm)
• 1x antenna (80mm)

Recommended for

• 3-5 inch digital HD freestyle builds
• 2-3 inch micro digital FPV builds
• Cinewhoop and cinematic FPV builds
• FPV racing setups with DJI Goggles 3 or N3
• Pilots upgrading from analog to digital HD FPV

Build compatibility

The DJI O4 Air Unit transmission module uses a 30x30mm footprint and connects via the included 3-in-1 cable. Flight controller firmware must support SBUS protocol for use with the DJI FPV Remote Controller. Note: the DJI RC Motion Series is not compatible with the O4 Air Unit. For complete digital build components, browse our FPV VTX and digital systems collection.

Important: Always ensure adequate airflow over the unit during flight — like all DJI Air Units, the O4 will shut down if it overheats on the bench without airflow. Power on and take off promptly after connecting the battery.