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How to Connect a Controller to an Android Phone or Tablet
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2.4G Wireless Controller For Switch Gamepad For Pc/Android /PS3/IOS Gaming Joystick Driver-free Installation, Fast Connection - AliExpress
GameSir T4 Kaleid Wired Gamepad with Hall Effect for Nintendo PC Steam – GameSir Official Store
Controller Supported Iphone Games|bluetooth Gamepad For Android & Pc - Wireless Joystick For Tv/tablet
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Switch Pro Android driver observations while testing this, otherwise solid, $20 3rd party Pro controller and comparing with 8bitDo alternating between Switch and D-Input modes (details in comments) : r/Stadia
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