This product fits my hands well, with the iPhone XS MAX I have large hands and comfortable grips. The triggers are reactive and make close contact with the screen. They fit so that no matter how wide your phone is, it slides in easily and stays in place with little rubber pads that fit over the controller itself. It doesn't slide back and forth or wobble. The fan function is handy and keeps the phone nice and cool, even a bit cold on the back. The battery life is long. It is possible to get at least one and a half full charges by playing the game and working as a fan. It takes about 6 hours to fully charge the controller itself. Overall this is a good solid product, light weight and conveniently packaged in a small bag to keep and travel with. I recommended it to my friends and let them play PUBG Mobile on it and they all buy it too. I haven't tried it with any other game, but I know Fortnite Mobile works the same way, so it's great for that too.
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