Confidential Whiteboard Recommendations?

Hi all,

I need to buy a whiteboard that I can install against a wall, but which can be easily removed if I need to have it at my desk.

It needs to be a confidential whiteboard (e.g., a whiteboard I can close up at night), owing to the fact that I need to work with sensitive client documents and matters.

Does anyone have any recommendations?

Many thanks in advance!