Are all USB 5v?

Related questions

1. Are all USB ports 5 volts?
2. Is 5v 2a charger a fast charger?
3. Are all USB chargers dual voltage?
4. How long does a dead phone battery take to charge?
5. Are Macbook chargers dual voltage?
6. How can I charge my dead phone battery?
7. Is it safe to use 2a charger for 1a device?
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Tags

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16. #easily
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18. #chargers
19. #whether