That’s a Microsoft Arc mouse, which I own. It’s cool for a laptop mouse, but the scroll is absolutely useless and I hate it. I like to use a mouse when editing photos in LightRoom and some PS/AI on the go, so I only use it with my Mac Air.
For CAD I’ve been using a Logitech MX518 for 5+ years now (together with 3DX SpaceExplorer)