A smart plug can turn any of your home appliances into smart products, letting you control them even when you're away from home. There's only one difference between a 'normal' plug and smart plug, but it's a big one: wi-fi support. With a smart plug in the wall, you can interact with it using your smartphone or tablet. You can combine the smart plug's powers with parental controls that come pre-installed with iPhone models and most Android smartphones. You might want to drift off with the fan on, but a smart plug will stop it from running all night long.