I was initially very happy time in this key case. I used it for an apartment that I rent a vacation rental. So guests arriving late are able to retrieve their keys in this way. But one night, a customer, who arrived around midnight can not open the case. So he returned at midnight at the door, unable to get his keys to his apartment. Not great ... The next day I go to the apartment and it is impossible to open the case also. 3 days after, I go and miraculously the case decides to open ...
So I decided to change housing because having a box that suddenly opens and a phone not open, not very professional.