Plug any switch with a standard 1/8" plug into this Triangle Light. Press the face of the light to put it in the ON position to allow it to be controlled with your switch. Then press your switch to activate this bright light. Light comes on when the switch is depressed and turns off when the switch is released. Great for teaching cause-effect or beginning switch use, as an indicator for visually impaired individuals that the switch was pressed, or as a reinforcer used in conjunction with another reinforcer. An easy way to test switches, too. Use our Y connector to attach your switch to both the Triangle Light and another reinforcer such as a toy. Measures 2.5" and 1" thick. Uses a single switch and 3 AAA batteries (neither included).