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So I bought this one a long time ago and I had forgotten if it is a gen 1 or 2 controller:
Is it 1st gen or 2nd?
Look to see if there is a light bar across the top of the touch pad. That's the only aesthetic change made to the controller, the rest is internal and latency.
If there is a light bar - gen 2. Otherwise gen 1.
Required, but never shown