Let's start first. There are no instructions. So if you're one of those people who haven't played with Lego and figured things out on their own, you're in trouble. However, this is not our problem. We ordered 2 of these so both have the issues listed below. VERY DIFFICULT TO CONNECT ABOVE! It took 3 people trying different things and we finally got it after 10 minutes of inactivity. It took 4 controllers in a total of 15 minutes. The cases are NOT tight to the controllers. Lots of gaps and bubbles. Also, you can clearly see from the photos that the covers don't go beyond their respected areas, even after trying to fandangot them. To install. They will very soon be replaced by another supplier in the very near future. I will update it after playing with it for 4 to 8 hours. We had time to release them on 2 separate Ovulus Quest 2. . They do their job and feel a little weird from time to time. but they do their job. Four of us have tested them and all agree it's going to be a HUGE pain @#$ changing the batteries every time. Fix bugs and make them fit controllers snugly and make it easy to change batteries and you'll be a winner.