2006 beetle key fob dead and car alarm goes off random
 

My daughter told me her car alarm went off the other night and she couldn't understand why it was doing it. I asked if she had pressed the alarm button and she told me the key fob has not worked in a couple of weeks. I was hoping maybe this has happened with somone else. I'm guessing the battery is dead in the fob. Can that be done at home or should I just contact my local volkswagon dealer and let them handle this? Thanks guy's.