The Plug’n’Grow 120-volt Multi-Circuit OFF Switcher Relay automatically shuts down a CO₂ generator or dehumidifier when a venting system or component on another circuit is engaged, preventing the waste of electricity and CO₂. This unit is capable of supporting up to 120 volts or 15 amps. All Plug’n’Grow products are covered by a three-year manufacturer’s warranty.