S1’s Base Unit is completely waterproof, but not the whole Main Display Unit. The waterproof rating of ProTemp S1 Main Unit is IP54, which can prevent some splashing but cannot be exposed to rain for a long time. You need to cover ProTemp S1 or put it back indoors on rainy days.

Note: Breezo is not waterproof. Please be careful not to let water enter Breezo, otherwise it may cause damage.