Test reports of an Osmo Action 4 camera have popped up in regulatory filings, indicating DJI could be prepping for another launch event soon.
DJI Osmo Action 4 4K Action Camera Standard Bundle Gray CP.OS.00000269.01 - Best Buy
DJI Osmo Action 4 Standard Combo — Glazer's Camera
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Osmo Action 4 4K/120fps Camera Standard Combo – DJI Official Retail UK
DJI OSMO Action: In-Depth Review of DJI's First Action Camera
DJI Osmo Action 4 4K Action Camera Standard Bundle Gray CP.OS.00000269.01 - Best Buy