Now that they’ve been around for years, smart plugs are inexpensive, and so simple to set up and use that anyone can do it. They are endlessly versatile — you can schedule lights or fans to turn on and off whenever you want, remotely start your coffee maker in the morning, or turn any outlet into one that now has a switch. They are especially useful for holiday lights that are hard to reach to plug and unplug them, because everything is controlled with an app or voice command.