will i be able to use a in dash dvd player for my car in south africa if i buy it from the usa? How do i know?

Question

it's a pioneer AHV-P5700dvd car player

Answer 1

not exactly familiar with that model but industry wise it should not work.
DVD players are region coded. A player bought in the US should be region 1.
A movie bought in Africa should be region 2.
Put the movie in and the player is supposed to tell you that it can't play because of the region conflict.

So, to work you would have to order your movies from the US, which might be a customs hassle. Or look for moveis that are marked "any" or "Open" region coding (like porn).
Or sometimes on the internet you can find out how to modify the region coding for your player.

Answer 2

yes but all you need to know is the electric voltage used there. in the US we use 110v but in some countries they use 220v which would fry your DVD player. Thats all you have to worry about.