Worst lock ever. I have 146 of them. Many problems and no help from the company. Does not work correct with Android. Many quirky issues. I was told that the problem is my phone and that I need to purchase an Apple. Random doors unlock as I walk down the hallway. Yearly fees per lock. Uses 6 batteries per lock 3 months in many are low already. I could literally unlock and lock any door with a key 15 times before the app could unlock it once. This system has extreme security issues.