【To ensure your satisfaction and facilitate a smooth transaction...】 * If this is your first transaction with me, please read my profile.* This is a set of 4 Meros smart plugs. You can use them to turn electrical devices on and off with a timer, and also remotely via the internet. This is convenient for controlling devices that are turned on directly with a physical switch, or devices that turn on when plugged into an outlet. ※Important Notes※ The plug shape is asymmetrical (polarized), and may not fit into standard extension cords. (It can be used with extension cords specifically designed for polarized plugs) This is not an issue when plugging directly into a wall outlet.