MU-style sensing edges mount directly to the bottom of a commercial sectional door or material handling system, no mounting channel required. The durable vinyl jacket that covers the internal switch forms two top tabs that were designed to wrap around a leading edge. The flexibility of the MU21 sensing edge allows it to conform to slight irregularities in the floor or other surface. When touched lightly, the sensing edge will send an immediate signal to operator controls to stop and/or reverse door operation.