Hydrologic 4-Zone Digital Timer. This easy to program, large LCD screened timer can be programed for individual days of the week. You can also automatically water up to 24 times a day. You can bypass the timer with a manual control if needed, as well as bypassing it for a rain delay. Water 4 areas from one faucet. Takes 2 AA batteries not included. Retains programming through battery changes. Zinc coupling nut with rubberized grip. Works with Melnor Hydrologic Soil Moist Sensor (not included). Gray/Black.