First, start with a fresh 9V battery! It’s a good idea to label the battery with the year you’ve installed it, but if you plan to install a new battery each year, don’t bother. One fresh 9V battery usually lasts the entire season.
If your hose end timer is gray in color and looks like this picture, here is the manual.
If your hose end timer is more of an aqua-green color, find programming instructions here.
