Not sure how long these have been out. I located a YouTube video review of it and bought one for myself. It's a simply and easy locking device for the camera and also covers the lens. It replaces the two piece stock DJI items. I like this much better as its easy to install all in one motion. I think it's a little on the expensive side at $20 + $4 shipping but its made with a 3D printer when ordered so that is a little more expensive.
[youtube]https://www.youtube.com/watch?v=BswkqCJxloU[/youtube]
[youtube]https://www.youtube.com/watch?v=BswkqCJxloU[/youtube]