Does it support simultaneous transmission of M300 dual gimbal image?

This is not supported at the moment.

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What is the Osmo Hanging Neck Mount compatible with?

It's compatible with Osmo 360, Osmo Action 3, Osmo Action 4, and Osmo Action 5 Pro.

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The Osmo 360 supports Wi-Fi 6.0 and USB 3.1.