WINGONEER&reg; -50-110&deg;C W1209 DC 12V Digital Mini Thermostat Temperature Controller Control Switch Sensor Module Connect the power supply and the load, then you can supply to the controller. Now the controller automatically performs the relay by setting off. This temperature controller output is 10A relay, meeting various high-power loads. Indicator: OFF indicates the relay is switched off; ALWAYS indicates the relay is closed.