hunter pro-c pc-400 4 zone base controller; outdoor model w/internal transformer and lockable cabinet pro-c the new pro-c 400 will easily accommodate hunter’s solar sync without additional wiring. the new solar sync dial position makes it easy to upgrade and program any pro-c to smart control. the hunter solar sync is an epa watersense labeled smart device which calculates evapotranspiration (et) and adjusts hunter controllers daily based on local weather conditions, resulting in water savings and conservation.