RJ12 Jack Connectors - EV3/NXT LEGO Compatible - Pack of 10 : ID 4434 : $3.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: LEGO MINDSTORMS EV3 31313 Robot Kit with Remote Control for Kids, Educational STEM Toy for Programming and Learning How to Code (601 Pieces) : Toys & Games