EnvisionLED S-TWC-MW-1 Bi-Level Microwave Sensor for High Bay LightEnvisionLED S TWC MW 1 S TWC MW 1 Product Description The S TWC MW 1 is a motion sensor that dims lighting from high to low based on movement. This slim, low profile sensor is designed for installation inside the bottom of a light fixture body. The sensors use microwave sensing technology that reacts to changes in movement within the coverage area. Once the sensor stops detecting movement and the time delay elapses lights will go from high to low mode