Questions about DJI Extension Rod Kit

To press the shutter button on a 1.5m extension pole for the Osmo Action 3, you can either operate the camera directly or use the DJI Mimo app. The app allows you to control the camera remotely, which is particularly useful when the camera is mounted on an extension pole. Alternatively, you can also press the shutter/record button directly on the camera if you are nearby. There is no special remote control for the extension pole itself to press the shutter button.

Yes

Yes, it is a telescopic rod that can be pulled out like a fishing rod.

It doesn't float... but I also used it in the sea and it was very useful.... Unfortunately, salt and sand get into it, but it can be used afterwards!