LEGO part 59510c01 - Light Bluish Gray Electric 9V Battery Box 4 x 11 x 7 PF Complete Assembly with Orange Switch and Dark Bluish Gray Covers at BrickScout
Power Functions Lights
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LEGO® Power Functions Light 8870 | Other | Buy online at the Official LEGO® Shop US
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Lego Electric Light Unit 61930c01 Black PF Lead 9688 10268 8297 8870 4999 41999 | eBay
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LEGO® Power Functions Battery Box 8881 | Other | Buy online at the Official LEGO® Shop US
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LEGO Power Functions Cable, LEGO® lighting – Light My Bricks USA
Power Functions motors presentation
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LEGO® Power Functions Motor Set 8293 | Technic™ | Buy online at the Official LEGO® Shop US
How to Hack a LEGO Power Functions Cable for Direct 9V Power - GeekDad