You may need to provide a little more background before someone can answer this...

Do you own one yet? If so this should be written on the power adapter itself. It should say it's voltage range.

If not, what country are you in? - someone in that country may be able to help you with what adapter is supplied there. I live in a 230V country, and the Deco M5s sold here obviously come with an adaptor that works ;-).

Lastly, the M5 uses a USB C connector for power and the adapters are standard (to the extent that they are interchangeable with my Windows Tablet charger.) So an 3rd party adapter could be purchased easily - including at your travel destination to match local sockets if required.

Yes, it supports 100-240V.

Barry M wrote

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Can the power adapter for the Deco M5 handle 220 volts
I travel extensively and need to cover 115 to 220 volts