If you're on the road (or in the sky) frequently, we'd recommend the Rohm, Hushh, or GO - their compact size and compatibility with power sources around the world make these units your best option.
We do also hear from plenty of people who like to take their Dohm along while traveling. Please be aware that because there's a small motor inside, the 120 V Dohm does not like to travel internationally.
There are other models of the Dohm that support international voltage. Ensure you purchase the correct machine that supports the voltage of the country you’re planning for use in. We do manufacture 240 V (AU, EU, & UK) Dohms - please see options for purchasing international products here.
The Dohm is only safe for use within the USA and Canada with a 120-volt plug and should only be used in a 120-volt polarized outlet. Do not use a universal travel converter to change the power levels if you are using the product in a different country. We do not recommend using this unit outside of the USA and Canada under any circumstances or with a universal travel converter as this can lead to damage to the Dohm and the converter.