Questions about Sony Rm-Vpr1

Yes, works fine on my Sony A7R3

ja https://support.d-imaging.sony.co.jp/www/cscs/accessories/compatibility.php?area=eu&lang=de&mdl=RM-VPR1&cat=3&loc=de_CH

I checked on the Sony websites: No

I think that all Sony cameras that can be charged via the mini USB port, the thing works.

I don't know, maybe there can be an extension cable. I don't know your area of application, but at best a wireless trigger would be worthwhile for you, then you would be completely independent.

Probably not compatible. See following thread. https://www.dpreview.com/forums/thread/3592450

We assume that you are referring to the camera at the following link: https://www.digitec.ch/de/Comparison/2547005-2547011 After clarification with our responsible department, we can confirm that the remote control is suitable for this model.