This is an on/off rocker switch. These types of switches are commonly used to control the flow of electricity in a circuit, turning a device on or off. Description: The switch is a small electrical component, typically made of plastic, with a red toggle that rocks back and forth to change its state. It has metal terminals on the back for connecting to a circuit. Purpose: Its primary purpose is to provide a simple, user-friendly way to control the power to an electronic device or appliance. For example, similar switches are used as the on/off power switch for Hoover Windtunnel vacuum cleaners.