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USB is 5v.
IMO 0.5v is a misprint.
If it has a USB shaped hole it's 5V.
The amperage rating on the charger determines how fast it will charge whatever you're putting on it.
If you take a teeny little 1A or whatever charger and try to charge your iPad it will work, but you're going to be waiting forever.
A bigger, 2.4A or 4A more robust charger will charge your stuff faster, and won't hurt anything. It is just capable of providing more.
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1983 SC Coupe
1963 BMW R60/2
1972 Triumph Tiger
1995 Triumph Daytona SuperIII
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