This is a heated wide angle wing mirror glass for the driver side (right side in some markets) of the Mercedes B Class W245, covering 2008 to 2012 – specifically the MPV body style.
From Ace Car Parts, part number ACE5059450577759.
It’s made in Taiwan with a clip-on attachment – real easy to install, no special tools needed.
The glass is aspherical, so it gives you a wider view and reduces blind spots – super handy for highway driving.