Wind vane uses German Hall effect sensor for precision and durability. Many potentiometer type wind vanes have a dead spot of several degrees, friction from the sensor and a defined life span. Agrowtek's wind vanes have zero dead band, are near-zero friction and have a theoretical infinite life. Includes mounting brackets and 25 ft of outdoor rated cable. Extend sensor wires up to 100 ft from transmitter. Mount transmitter indoors up to 2,000 ft from controller. Must be connected to Agrowtek's Weather Transmitter for use with GrowControl controllers.