Not one of ours but it is such a good product we thought we should share it. After user research this company found users were more likely to loose keys or leave behind key cards than their smart phone. So this UK based company made a solution and its called Doordeck.
Go to their site here: https://doordeck.com/solutions. It is increasingly relevant in a world where smart phones are becoming service partners for security and convenience. As long as the infrastructure can be allowed this solution makes perfect sense as your phone allows you to unlock doors without the need for a key, fob or card.