Garmin Instinct wall charger

Any charger that accepts USB connections. Anker, Aukey just to name a few.

It doesn't matter voltage or mA?

Every USB charger has the same voltage, and current output is likely not to matter as well, because the instinct draws very little power, so the standard USB 500mA is sufficient.

Please tell me, what wall charger can i use?

I use a little 4000mah powerbank with 2A output and the Garmin's wire always in.
No need for any plug in the wall. And the Instinct is easily charged everywhere, in any hotel room and any part of the world...

I use my phone charger, I think it is 1A or 2A output