DON'T use them . they are unreliable and locked our valuables in more than once along with our neighbours next door. all we did was lock our money and other valuables in my purse in a suitcase and put a combo lock on it. I left stuff out but nothing was ever taking.
Never one to say someone else here is wrong, but I've never had a problem with mine other than the batteries going dead. It was a pain in the a**, but they got it fixed and all was well.
There was safety deposit boxes at the front desk that were free to use, don't know if they are still there, we haven't used them in like 6 years.
