Anyone know what is Temperature Sensor + Relay Module for Arduino for?

Are the Temperature Sensor and Relay Module separated? how to control?

Thanks

what module r u talking off?
what do u want to control with that relay?

RIDDICK:
what module r u talking off?
what do u want to control with that relay?

I can control small PC fan,

it seems like it is controlled by temperature...
there is no other way to turn the relays on or off...
the temperatures can b controlled by the potentiometers...