Useful for lots of things - my earbuds have a really vague charging light, but if it says 0.00w I know it's done. I have a Nintendo Switch Pro Controller with a

Useful for lots of things - my earbuds have a really vague charging light, but if it says 0.00w I know it's done. I have a Nintendo Switch Pro Controller with a dodgy connection too, and it lets me know it's actually charging.