Keyless Access Systems

Exactly the topic of power failure, are there systems with battery operation for a certain period of time or does it really have to be the UPS?

Are there also any proprietary systems from the manufacturers - but I wouldn’t invest anything in the single-family house sector because it’s very expensive. Either an additional lock on the front door (the simplest & cheapest solution) or just arrange for another door.

I still have slots available in the mailbox system for the intercom and video system

May I ask which manufacturer the mailbox system is from, or is it self-built?

I had planned, or rather plan again, to install a nice system... it is supposed to not only work but also look good on the front door...

Unfortunately, Ekey and similar options are out of the question for me...

So far, only the GU-Security motor lock is installed...

Why is eKey not an option for you? There are even integrations available in [the] Griff.

May I ask which manufacturer the mailbox system is from, or is it self-made?

The company Ercoteh is building the flush-mounted box for me.

Firma Ercoteh baut mir den UP-Kasten.

After googling, I have now also landed on them, are there alternatives, or why did you choose Ercoteh specifically?