Gallium nitride picks up where silicon ends — it's stronger, runs cooler, and is finally cost-effective enough to end up in cheap devices like wall chargers. Like most everyone else I have a pile of random phone chargers that sits mostly unused. I've recycled all the horrid low-power ones that used to be good enough to charge a phone and kept the best USB-C chargers , but still have more than I'll ever need. I even have a good many that support USB-C Power Delivery so I really don't care that phone makers pretend to care about the environment and don't include one in the box. I also rarely use any of them, because I have one that's a lot better in every way. You see it in the photo above, where it looks like just another charger, but it's actually a 100-watt Aukey USB Type C gallium nitride charger. It's a little bigger than the crummy charger that used to come with every phone, but it's also powerful enough to charge two laptops at the same time