As you can see from the picture above, it comes with a transmitter, receiver and two probes (one for food and one for the grill). You simply place the probes in place, shut the grill and monitor the temperature from anywhere within 300 feet. It comes in handy for just about everything I cook on the grill. The ability to monitor the temperature from inside the house when it is over 100 degrees outside is a major upside. I am sure I will be just as impressed in January when it is freezing cold outside.
The ability to see the temperature of the food without opening the grill makes it easier to make sure you pull the food off the grill at the perfect time. I have read that the wires to the probes can burn and ruin them, so I just wrap them in aluminum foil and, so far, I have had no issues. However, they do sell the probes separately, so if you burn them, you can always buy more.
While I can say that my unit is a 5 star product, the inconsistency of the model (see the Amazon reviews) makes it harder to give it a 100 percent recommendation. However, I love mine and would not hesitate to buy another one if it broke.