ZTE MF283+ Router: Need Replacement Power Supply - Model ZTE STC A20120150C55-A, 12V 1.5A, Tip Size

Hello,
I need to buy a new power supply for the ZTE MF283 + router. The old one has the following data, model ZTE STC A20120150C55-A. Input 0.8A Output 12V 1.5A. Nowhere can I find information about the size of the tip going into the router. At some archival auction there is information 5.5 / 2.1 but I am not able to confirm it. By the way: do I need to buy a new power supply with exactly the same out-out data?
Thanks

Certainly, the power supply must have an output voltage of 12V and an output current of 1.5A or higher (it can be e.g. 2A)

Added after 2 [minutes]:

Regarding the plug, buy a 12V power supply with any plug and buy a DC 2.1 / 5.5 plug and just cut the old one and solder the new one.

Why combine it, if for 5, 6 or generally less than 10 PLN you can buy a 12V power supply with appropriate performance with a 5.5x2.1 plug?

http://allegro.pl/zasilacz-12v-2a-dc-przelotowy-5-5-2-1-led-kabel-i6596943193.html
http://allegro.pl/zasilacz-dc-przelotowy-12v-3-8a-5-5-2-1-sagemcom-b-i6590148637.html
http://allegro.pl/zasilacz-apd-12v-2-5a-5-5-2-1-30-watt-pasek-led-fv-i6377903415.html

And many others...

Ok, thank you, I thought that this number of amps could be limited by the router, but as I understand it, the number of amps in the output in this case is so important for the router that it is not less than 1.5A and of course 12V. Thanks. I also assume the 5.5 / 2.1 size is appropriate for this router model.

At some German auction I found your PSU model and it was described as 5.5x2.1, but unfortunately I can't be sure either.

1.5A is the current efficiency of the power supply. When loading the power supply, we cannot (should not) consume more current than its current capacity. The router can charge up to 1.5A (since such a power supply was delivered with it at the factory), if we give a power supply with a higher capacity (2 or 3A or even more) - nothing bad will happen, it will have a slightly larger reserve.

Of course, the tension has to match.

Take a look at the polarity of the power supply you are buying. In 95% of cases, the plus is inside, but it's worth checking before buying and connecting. Appropriate symbols should be on the power supply.

Very helpful. Thanks!