The Xbox Elite Wireless Controller Series 2 Core is mostly the same gamepad as the flagship Elite, but with some extras stripped away to reach a lower price.
It's basically the Elite minus the accessories
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Xbox Elite Wireless Controller Series 2 – Core
Customer reviews: Xbox Elite Series 2 Core Wireless
Xbox Elite Wireless Controller Series 2 review - The Verge
Customer reviews: Xbox Elite Series 2 Core Wireless
Xbox Elite Wireless Controller Series 2 Core Review - Yeah Nah Gaming
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New Xbox Elite Wireless Controller Series 2 Core is Cheaper
Xbox Elite Wireless Controller Series 2 – Core
Xbox Elite Controller Series 2 Core review: Semi-pro
Xbox Elite Controller Series 2 Core review: Semi-pro