Trigger if in a group all devices are on

I quess a stupid question:
i like to have a trigger when all devices of a group are on.
I know that when one of the devices is on in a group the group itself is “on”
But i like to know if all devices of an group are on and then make a group on and trigger an action?

Any advice?

set the boolean option of the group, you have it in the group documentation

all boolean (optional, default: false)
Set this to true if the group state should only turn on if all grouped entities are on.

Thanks thats easy, I didn’t see it :thinking: