This is a visual breakdown on how to take apart a Mercedes Benz smart Key fob, style DC12K . The parts are serviceable, but YOU MUST PERMANENTLY BREAK THE EPOXY SEAL. No worries, though. It puts back together very nicely and securely. This FOB was run over and stopped working, so the battery contacts to the board needed adjustment. If you are in a rush, the basic walk through is https://www.youtube.com/watch?v=vj4s4kWof9E Enjoy and leave comments below!