Quality-designed to automatically activate windshield wipers, eliminating need to adjust wipers during misty or intermittent rain. During rainfall, sensor accurately analyzes infrared light refracted off windshields and properly adjusts wiper speeds accordingly, allowing drivers to concentrate on road instead of adjusting speeds on their own. On BMW applications, sensor doubles as automatic headlight sensor, activating vehicle's headlights in low-light situations. All TechSmart(R) parts meet or exceed OE performance, providing today's technician with the quality parts needed to get the job done right, the first time.