The 120V IoT relay allows you to run any 120V devices with your ClimateIQ controllers. Low voltage output from the IQ controller connects to the 120V relay, allowing you to plug your 120V devices directly in. Rated for 12A @ 120VAC. There are (4) outlets total: (2) Normally Off, (1) Normally On, and (1) Always On. This essential devices allows easy operation of CO2 regulators, fans, humidifiers, and more!