The ASL 202 Fiber Optic Sensor with Mono Output and 24 Volt Connector is a single function switch with a round target area a 1/8th inch in diameter. It has an adjustable activation range from 1/4th to four inches. The fiber optic switch can be programmed for either normally open (NO) or normally closed (NC) operation. In the NO mode switch activation occurs when an object is detected in the adjusted range. In the NC mode switch activation occurs when an object is no longer detected in the adjusted range. This configuration plugs into any device that has a mono jack port such as; reset/mode change, tilt, or a communication device and requires a 24 volt power source (not included). Typical users are individuals with extremely limited movement such as MD, MS, ALS and SMA.