Good point. That may have been a bad example. Maybe a small battery powered version, charges via USB like https://smile.amazon.com/Evapolar-EvaLIGHT-Evaporative-Humidifier-Conditioner/dp/B081LPQJ5Q or https://smile.amazon.com/Portable-Conditioner-Battery-Personal-Evaporative/dp/B09PDYHB4G