The Twitch switch can be activated by a movement as subtle as the wrinkling of a forehead. Users can increase or decrease the amount of muscle movement needed to activate the switch and can choose from three operation modes: on-off, momentary and timed. Use the on-off mode when operating a device that needs to remain on until the user wants to turn it off; the momentary mode when operating a toy or communication device; and the timed mode when operating a device that you want to stay on for a preset period of time (adjustable from 1 to 120 seconds).