FAVOLCANO CN101 DC 12V 16A Digital LCD Power Programmable Timer Time Switch Relay Rated control voltage: 12V DC/AC; Contact capacity : 16A(8)A, 250V AC Up to 17 on/off programs, Independent time settings for minutes, hours, days, and more With the built-in battery, the unit retains the programming setting even in a power outage Save time and energy by automatically turning on and off lamps, Christmas tree lights, fans, heater and other electrical devices Essential for all hydroponic system, great way to keep everything on track and promote the healthy growth of your plants and flowers