You might be tempted to pick up one of the best smart plugs and use it outside, but it's not advisable. Outdoor smart plugs are specifically designed to withstand the weather, and keep water out to a certain amount — you can't dunk them in water, for instance. Indoor plugs don't have that protection, so they can be damaged and stop working more easily. That's not only an inconvenience but could also be a safety hazard, too.