Yes, you can use most Sunlighten saunas outdoors (including the mPulse) if you pick the appropriate wood finish (eucalyptus). The basswood finish isn’t meant to be used outdoors and doing so might void your warranty. Regardless of what sauna you choose, make sure you also get the Sunlighten Sauna Cover that fits your sauna to keep it protected from the elements (and to keep your warranty valid).