Single Switch

An assistive technology input device that provides a single binary action — on or off — enabling people with severe motor impairments to interact with computers and communication devices. Switches can be activated by virtually any reliable voluntary movement, including a blink, head movement, facial muscle contraction, puff of air, or finger press. They are typically used with scanning interfaces or specialized selection methods to navigate and select from on-screen options, serving as the primary computer access method for many people with conditions like cerebral palsy, muscular dystrophy, or spinal cord injury.