Is it attached?

This is our current thermostat.

I bought my husband (from our dog and cat) a new programmable thermostat for Christmas.  He has a tendency to turn the heat off when he leaves for work and a few weeks ago it snowed like an inch and people forgot how to drive and it took HOURS to get home.  So, by the time he got home it was close to 10 pm and our dog was shivering in the doorway to our room.  Hence the gift from the dog and cat.  The problem is, we're not sure how to get the thing off the wall!  I did find the manual though, and I just emailed it to him.  Hopefully he can figure it out.  I have faith, he did install a whole kitchen without knowing what he was doing!  I'll keep you posted.