The see thru window.  It was easy to assemble the cart itself but the electrical wiring was all wrong.  My husband and I worked on it for 5 hours for 2 days trying to get the two wire connectors together.  They would not go for love nor money.  Whoever wrote the put-together instructions needs to rewrite in better terms. It is ridiculous to pay this much for a grill that does not go together as promised.  We are not able to use the night light as well. This is the 1st item I have bought from Wayfair that I am not entirely pleased with.