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Amazon.com: VHBW Charger 10V for Lego EV3 45517 Battery Lego Technic Mindstorms NXT9797 NXT8547 Intelligent Brick Rechargeable 9693 Battery Box 8878 Element 86444 Replacement Lego Transformer
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Connecting with Bluetooth to LEGO® MINDSTORMS® EV3 apps - Help Topics - Customer Service - LEGO.com US
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