What is Single, 5050 and 6072?
These are the mortise and latches size. 5050 and 6072 is Double Mortise depends on what sizes you need and what are you currently using (If any).
How long can the battery last?
It’s expected to last for 3-4 months and also depending on the quality and the usage of the door lock.
What kind of RFID card can be used?
As long as its MIFI RFID Card will do, no card writing and copying needed.
Is the lock suitable for my grille door?
No, would not suggest it if your grille door gap is big. As other people may be able to open from the inside.
What are the differences for app and without app?
The Main differences are the model with the app: you’re able to generate temporary used passwords, receive notifications when alarms are triggered and also when and how is the lock being unlocked. Lastly you are able to see the battery level in the app. Other than these they are the same.