I agree with the MBs being the best thing for unlocking doors! I have a PopSocket wallet on the back of my phone where I keep my debit, ID, and one credit card. At pool time, I don't always like to bring my phone with me so I will sometimes just leave it in the safe in my room. The MB is awesome for charging drinks/food and then unlocking the door when we are ready to return to the room. Love the all-in-one features it has!