A button lets your users trigger immediate actions in a mixed reality experience. In HoloLens 2, buttons have visual cues and affordances that help increase interaction confidence with users.
Pulse on trigger
Button in MRTK(Mixed Reality Toolkit) for Unity
MRTK provides various types of button prefabs, including shell-style buttons for HoloLens 2 and HoloLens (1st gen). The HoloLens 2 button prefab contains several detailed affordances that help improve user confidence:
Compressing front cage
Pulse effect on trigger.
Check out the MRTK - Button for more instructions and customized examples.