I have bought both the Raindrip dual-station and the single-station timers, and all have quickly failed.  Inside, a motor-driven gear assembly opens and closes the water valve, and the gear shafts break.  So, it becomes a throw-away!  My collection lies in a heap in my garden shed.  I'm going to send them all back to Raindrip!  And please do not confuse this RAINDRIP product name from another, called RAINBIRD, which is a completely different company.