The mechanical sprinkler features a 120 minute timer so you can set your watering duration using the simple dial from between 15 to 120 minutes, the sprinkler will automatically switch off after the required amount of time, alternatively you can set the timer to Manual On for continuous watering. The timer is mechanical so no power or batteries are needed to make it work making it extra safe for outdoor use. Simply connect the timer to your standard outdoor tap and attach a sprinkler.