HS720-4K - remote control button

[DaGa]

Hi, I have one question - On the remote control of my HS720-4K there is one rotating button /top left corner/ that doesn't explain in the manual that come with the drone for what function is
So, can someone tell me for what is that button ?

P.S. I downloaded from the official site of Holy Stone user manual for my drone ( HS720-4K) ,also downloaded and the manual for HS720E and HS720G but in all of them that button doesn't exist on the picture with explanation of the remote control

That is the button - the button rotating harder than the button on the right (for the angle of the camera)

 

[pavnish]

I think one of them is dummy that is what I read sometimes ago.

 

[DaGa]

Yes, I spoke with the support of Holy Stone a d the guy said exactly that to me - that button do nothing.