Varjo Aero
The Varjo Aero is a high end VR headset from Varjo. It is a flat focus headset with a resolution of about 2500x2500 per eye.
It has a hybrid halo headband design.
It works with SteamVR base stations.
References
This article uses text from xvrwiki.org: https://www.xvrwiki.org/wiki/Varjo_Aero