The Titan Controls 734155 Apollo 11 indoor digital timer is the perfect timing solution for your hydroponic system requirements. It provides up to 20 separate schedules per day, allowing even the most novice gardener a multitude of settings to accommodate any gardening needs. The Apollo 11 may be set to one-minute intervals and runs 20 separate timing schedules per day. This 240 volt timer can be used to run a grow light, pump, or fan. With a battery back-up feature that saves your settings in case of power failure, this digital timer is the most reliable solution for automated timing in your garden!