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If your controller has a separate plastic piece around the xbox button it is not a rev 3. If the body of the controller is all one piece around the xbox button then it is a rev 3. rev 1/2 looks like this: https://www.amazon.com/Wireless-Controller-Xbox-One-Console/dp/B06XRLQF8B/ref=sr_1_2?s=videogames&ie=UTF8&qid=1502160621&sr=1-2-spons&keywords=xbox+one+controller&psc=1 rev 3 is this: https://www.amazon.com/Xbox-Wireless-Controller-Black/dp/B01LPZM7VI/ref=sr_1_4?s=videogames&ie=UTF8&qid=1502160671&sr=1-4&keywords=xbox%2Bone%2Bcontroller&th=1
If your controller has a separate plastic piece around the xbox button it is not a rev 3. If the body of the controller is all one piece around the xbox button then it is a rev 3.
rev 1/2 looks like this:
https://www.amazon.com/Wireless-Controller-Xbox-One-Console/dp/B06XRLQF8B/ref=sr_1_2?s=videogames&ie=UTF8&qid=1502160621&sr=1-2-spons&keywords=xbox+one+controller&psc=1
rev 3 is this:
https://www.amazon.com/Xbox-Wireless-Controller-Black/dp/B01LPZM7VI/ref=sr_1_4?s=videogames&ie=UTF8&qid=1502160671&sr=1-4&keywords=xbox%2Bone%2Bcontroller&th=1