Why do the propellers of the DJI Matrice 3D series rotate slowly before take-off?

The propellers of the DJI Matrice 3D series rotate slowly before take-off for a few seconds and this is due to the aircraft taking a few seconds pre-flight to check the integrity of the propeller through the lenses. If there is any damage larger than 10 mm on the propellers, the take-off will be suspended to ensure flight safety.

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Is the DJI Osmo Nano waterproof?

Yes. The camera is waterproof up to 10 metres without additional housing.

Does the max transmission distance of the O4+ video transmission system on the DJI Mini 5 Pro vary according to the interference level of the environment?

Yes. In different environments, the wireless interference level of the Mini 5 Pro is different, and the maximum transmission distance will vary.