Melnor 65138AMZ AquaTimer Digital Hose Timer - 1-Zone Watering System with QuickConnect Bundle (Black & Yellow) - Perfect for Lawn, Garden & Outdoor Irrigation

I was about to give them a one star review and return them but as it turns out, they just needed new batteries. It doesn't take much to power the display but apparently the valve operation needs pretty fresh batteries. The problem was that zones would be just running all the time and the timer wouldn't control anything. I had purchased two of these and one kept zone 4 open all the time so it's possible that one was defective. The other one and the replacement for the bad one worked great for a couple weeks and then suddenly multiple zones would be open and running all the time.I was using the cheap Amazon AA batteries and before returning them as defective, I decided to try one last thing, new batteries! Now both are working well again.Setting them up is easy and pretty intuitive. You just toggle through the different positions with the middle button and make adjustments with the arrows. I was confused about the days at first, I set them to 7 days thinking that meant water all 7 days but it actually means water once every 7 days. If you want them to water every day set this to 1.