Rain Bird SST900IN Simple-To-Set Indoor Sprinkler/Irrigation System Timer/Controller, 9-Zone/Station. Rain Bird introduces the new "SST900IN" Timer packed with enhanced features and programming options (this new & improved model replaces the Obsolete SST900I). This indoor-mounted timer is so easy to use you won? t need the instructions!! Intuitive, simple zone-by-zone settings allow different watering schedules for each area of your yard; providing greener results with less water. 1