Help with voltage, resistor or voltage regulator

So I'm making an 360 WVI, and sits its wireless (duh) I'll need batteries I'll power the cotroller with the normal double AA's. But, the wireless reciever and screen will need batteries, oviously I need to stepdown the voltage for now I'm unsure exactly what reviever and screen I need but whats that thing, called votlage regulator? or resistor sounds right?
 
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