D7100 and a yn565ex flash question

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Si
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first things first , I am very new to flash photograpy so bear with me .
what I want to do is fire my flash (yn565ex) off camera . I have sussed out how to fire the flash using the onboard d7100 flash but I don't want use the camera flash to do this .so am I right in thinking im going to need to buy a wireless trigger . Would a yn-622n be what I need to buy ? if so would I need 1 or 2 ? does the flash have the receiver aleady built in so I would only need 1 ?
thanks .
 
You'd need a pair, and the best bet would be to get a YN622N TX and a YN622n.
 
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