Wind speed anemometer with 3 cup rotor measures wind speeds from 1 to 125 MPH. Extremely rugged for harsh conditions and sensitive to the slightest breeze. Simple two-wire connection to transmitter. 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.