The supplier's customer description states that the MR6400 is operated with 12 volts. However, the device is only supplied with 9V and with a 9V power supply unit. Correct in and of itself.
In my holiday home, I have voltage interruptions from time to time.

Ingenious idea: I buy an APC CP12036LI UPS to bypass the router so that I can control my network and heating from outside. Unfortunately, this UPS supplies 12V. This would be correct if the router was operated with 12V as described by the supplier.

Plugged in, it works, but the power supply unit (9V 1A) does not charge the UPS, but drains it in a few hours.
Is a 12V 3A power supply for the UPS the solution, or will my MR6400 then be overloaded?

Question

The supplier's customer description states that the MR6400 is operated with 12 volts. However, the device is only supplied with 9V and with a 9V power supply unit. Correct in and of itself. 
In my holiday home, I have voltage interruptions from time to time.

Ingenious idea: I buy an APC CP12036LI UPS to bypass the router so that I can control my network and heating from outside. Unfortunately, this UPS supplies 12V. This would be correct if the router was operated with 12V as described by the supplier.

Plugged in, it works, but the power supply unit (9V 1A) does not charge the UPS, but drains it in a few hours.
Is a 12V 3A power supply for the UPS the solution, or will my MR6400 then be overloaded?

Answer

I was able to do some research and the manufacturer states the following on their site:
- 9V/0.85A
However, there were apparently earlier versions with a 12V/1A power supply. Since the manufacturer does not specify a range, but an exact specification, there is unfortunately no leeway for 9-12V. I would therefore recommend using the specifications on the power supply and router. If it is labelled 9V, then it is better not to connect a 12V power supply.

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