SK speed control unit EC, Sensor for speed control, 10-12 V (DC), EC speed control Speed Control Sensor, External sensor with connection cable (length 3 m), 10 V - 12 V (DC), IP 40, 85423190, 1 pc(s), 0.441 lbs, 4028177696617, NTC sensor for the temperature-dependent speed control of EC fans to reduce noise and save energy.