Is this a legit charger?

CLICK

AFAIK Meizu has never manufactured such a charger in Mainland. I don't know if it's a genuine Meizu since it's not for sale here, but I'd say the chances it's genuine Meizu are 25%.

5v, 500mah. should work

Nope, not a genuine Meizu charger.

Hey, by the way I noticed that your plugs are the same as those in Indonesia How refreshing... I'm sick of seeing US three-prong and Chinese three-prong plugs here.

as long as it fits a mini usb plug, and is 5v and above 400mAH, you can use it as a charger. keep in mind that 500+ mAH chargers will charge faster but battery life lasts shorter. USB ports are 500mAH. takes longer to charge but lasts longer.