I love this controller! You connect via Bluetooth and can game for hours. The app is no longer available because they went out of business but it still functions just fine. I highly recommend this controller.
It’s a really good remote that works great with my iPhone and DJI Spark Drone, too bad the MadCatz company does not exist anymore so there is zero support. All the QR codes go to 404 don’t exist pages. Also one of the batteries leaked, but fortunately it was in a sealed package. The game controller itself is one of the better quality ones made by MadCatz, and it worked perfectly.
Works great but it seems MadCatz has gone out of business. The controller app is no longer on the App Store and what is left of their website does not have the links anymore to download firmware updates or full documentation. However, out of the box the controller worked with no problems on my iPhone 5s with the latest OS.