Q: The 37g Digital Whoop That Killed Our Analog Habit: Meteor75 Pro O4

Quick Answer

The BetaFPV Meteor75 Pro O4 is a 37g 1S brushless whoop that puts DJI's O4 digital link into a frame you can fly round the living room. It is the cheapest proper digital whoop we stock, and it sits between the £77.90 analog Air75 II and the £334.90 Pavo20 Pro II cinewhoop. Worth it if you already own DJI goggles; a waste of money if you do not.

Why Digital In A Whoop Is Now A Real Option

For years the argument against a digital whoop was simple: the air unit was too heavy and too hot for a 30g frame. The Meteor75 Pro O4 changes the maths. BetaFPV built a purpose-made Matrix 1S 3IN1 HD flight controller that stacks the FC, ESC and ELRS 2.4GHz receiver onto one board and drops the analog OSD circuitry entirely. The whole BNF lands at 37.2g on our scales with a 1S 550mAh pack and the O4 unit fitted.

That weight matters. Our analog Air65 builds hover around 17g and the Air75 II nearer 21g. The Meteor75 Pro O4 is roughly double that, so it does not float the way an analog whoop does. In our workshop it needs around 40% throttle before the props bite and it lifts off, where a 5-inch freestyle quad is airborne at 20%. Once you accept that, the payoff is a clean 720p or 1080p picture with DJI's latency instead of a snowy 5.8GHz analog feed.

The Specs That Actually Count

The 45mm Gemfan props are larger than the 40mm blades on most 75mm whoops, which is where the extra thrust and the longer flight time come from. It ships on Betaflight 4.5.3 (target BETAFPVG473) with ELRS 2.4GHz V3.5 firmware. One detail the box does not shout about: from late 2025 BetaFPV switched the gyroscope to the BMI270, so check your gyro version before you reflash.

The O4 Lite Heat Problem Nobody Mentions

Here is the bit the spec sheet leaves out. The O4 Air Unit Lite fitted to this whoop runs hot, fast. Leave the Meteor75 Pro O4 powered on the bench while you fiddle with Betaflight and it will hit its thermal limit and drop into low-power mode, throttling your picture. Pilots on the BetaFPV and IntoFPV forums have hit the same wall. The fix is to set the VTX to low power for ground work and only flip to high power once you are ready to fly. We keep a small USB fan clipped to the bench for exactly this. Treat the O4 Lite as something you arm and fly, not something you leave idling.

Meteor75 Pro O4 Vs Air75 II: The £100 Question

The honest comparison is not against another digital whoop, because there barely is one at this weight. It is against the analog Air75 II at less than half the price. BetaFPV themselves position the Meteor75 Pro as the easier, more forgiving airframe and the Air75 as the aggressive one. Oscar Liang came down the other way, preferring the lighter Air75 for the way it floats and survives crashes.

Our position: if you are buying your first whoop and you do not own DJI goggles, the Air75 II is the smarter spend. If you already fly DJI O4 on a 5-inch and want something to fly indoors when the weather turns, the Meteor75 Pro O4 is the one to grab, because you are not buying a second goggle ecosystem or an analog receiver just for the house. Pair it with the ViFly WhoopStor V3 six-port charger and a few 1S 550mAh packs and you have a complete indoor digital setup.

FAQ

Q: Do I need DJI goggles to fly the Meteor75 Pro O4?

A: Yes. The O4 version only talks to DJI Goggles 3, Goggles N3 or Goggles Integra. If you fly analog, buy the PNP version instead and fit your own 5.8GHz VTX. See our DJI O4 Air Unit guide for the full compatibility list.

Q: Is the Meteor75 Pro O4 legal to fly in the UK without registration?

A: It is well under 250g so it sits in the A1/Open category, but you still need an Operator ID and Flyer ID. Our UK drone laws guide covers the current CAA requirements.

Q: Will my old 1S batteries from an Air75 work in it?

A: Yes, so long as they are BT2.0 connector 1S 550mAh (or 450mAh) packs. The Meteor75 Pro uses the same BetaFPV BT2.0 connector as the Air and Meteor lines.