An honest review for this smart lock

I found this smart lock gadget on somewhere youtube review video. It seems good security for my apartment. They tell this can be unlocked with a smartphone. But worried about if it fails to open my room or if my phone dies then how can I enter to room, I mean is there any backup key system to unlock it. I will really appreciate it if anyone gives me an honest review of this gadget. Source

submitted by /u/Some_Mobile1674
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