The tested devices cost between 15 and 35 euros and all work according to the same principle. A garden hose is plugged into a receptacle on the device via the Gardena connection in 1968/3-inch format.
The water pressure sets in motion a gearbox that allows an integrated pipe to rotate slowly in the longitudinal axis. Nozzles are embedded in the pipe next to each other, through which the water "rains" evenly over a larger area. At intervals of 0.5 meters and 4 meters, the sprinklers run for 5 minutes at maximum power.