Apple watch
The charger doesn't fit any of my usb chargers, are any adapters available, none came with any!
Apple Watch
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You can use any USB-C port on a personal computer. You can use any USB-C charger from a recent iPhone, iPad, or MacBook Pro.
If you have an old Apple Watch, you can use its charging puck and charger.
You can purchase any vendor's USB-C charging brick. If it is 20watts are higher, it will Fast Charge the Apple Watch Series 7.