AS GRPPrecision GPS AntennaPrecision GPS/WAAS receiver provides fast position fixes accurate within 2.5 meters. Provides more accurate position fixes than the industry standar GPS.The receiver's dimension are: 3.25" diameter, 1.5" high and comes with 20' cable and has a 1"-14 thread count stem mountable with an optional atenna stem (atenna stem not included).WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.