The top control regulates how much ground is watered length ways, this control is easy to use even with the sprinkler working which is good as you can easily fine tune it to put water just where you need it and so not waste any.
This control sets how wide you want it to water, there is one at each end of the sprinkler bar and all it does is turn the knozzles outwards so widening the area covered. Again its very easy to use and can be done so with the sprinkler running.
All controls are in orange, it seems well made out of plastic, only having had it one season I can't say how durable it is but Gardena seem to have a good name. It wasn't cheap at £49.95 but for what you get I think it's okay and it puts the water where you want it so if you're on a meter you will save there. There are smaller versions also one like this but without a timer which are obviously cheaper so if you already have a water timer you could get one of these instead.Bob & Tom.