THe thing worked only a short time per attempt before it went off the track or the sprinkler arms blew off from the water pressure.  Can't turn up the water pressure above half on without a "blow out" occuring.  Got tired of fooling with the darn thing and sold it on e-bay.  I lost a little money but at least the old-fashined oscillating sprinker worked and worked very well.  I would not recommend this sprinkler to anyone.