This is a bundle especially made for the Telldus user that likes to grow plants, either in a greenhouse or outdoors. Or both.
Connect for example a water pump or a moisturizer to the receiver. Then let the sensor control when start it depending on the temperature or humidity.
For this to work, you need a TellStick and a Telldus Live! account. If you do not have a TellStick, you can buy one here. You save 10% on each of the parts when you buy this bundle.
Read more about each product on their respective page.