In various quality levels, these have been on the market for over 30 years; this one is particularly well made from heavy vinyl.
When it is not raining, it stays tightly coiled at the bottom of your eavestrough downspout. When it rains, the water pressure in the downspout slowly unrolls the sprinkler and water sprinkles out from holes all along its 45" length (it works even if only partly unrolled). Then, when it stops raining, it automatically rolls up into a coil again, out of the way of lawnmowers and trimmers.
Available in three colors and adjustable to fit any downspout with a circumference of 15" or less.
Prevents erosion and washout in your lawn and garden beds.
Made in USA.