LEGO part bb0961c01 - Light Bluish Gray Electric Battery Box Powered Up Bluetooth HUB with Dark Bluish Gray Bottom at BrickScout
Remote Control 88010 | Powered UP | Buy online at the Official LEGO® Shop US
Amazon.com: Build Your Own Teams of Robots with LEGO® Mindstorms® NXT and Bluetooth®: 9780071798563: Hughes, Cameron, Hughes, Tracey, Watkins, Trevor, Kramer, Bob: Books
Lego Train Bricks Powered UP Hub Bluetooth AAA Battery Pack Receiver 88009 NEW 673419309097 | eBay
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Test: BlueSmartControl, a Bluetooth controller for Lego creations - YouTube
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BTBox – LEGO Power Functions Bluetooth Controller | PlastiBots