I use these in my yard and have for at least five years. It is a simple mechanical water timer that is a case of analog simplicity. Set it and it simply runs for the time dialed in. It also has a constant-on setting. While not programmable like a digital timer, it allows you to control your watering in a relatively effective manner. The timer uses standard quick connector to hose. The only caveat is that if you live in a climate where freezing occurs you must bring them inside or they will be break if they have water still inside. Well constructed, reasonably priced. An exemplary cool tool.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.