This phone can have multiple phones that operate it. There needs to be 1 manager account. The first phone that links to the phone and sets up the account first will be the manager phone. Only this phone can manage settings on the lock. That manager phone can then share access to the lock with other phones. Both phones will have to have their own separate account and the manager phone would allow access to the lock to other phones. Lock can only sync to 1 phone at a time. It operates similar to a Bluetooth speaker.
This lock uses 3 AAA batteries. Typical battery life is Approx, 9 months. When voltage is getting low, the lock will have an audible alarm. The app also has battery status in the app so you can see when voltage is getting low. You need to change the batteries before they reach 21%. You must change batteries in this lock at this time as it will not open automatically. This Lock will stay locked. You can have multiple locks in your APP. You can take a picture instead of calling the lock a name to make it easier to know which lock it will operate