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LEGO MINDSTORMS EV3
Buy LEGO MINDSTORMS EV3 Building Set Includes 3 Interactive Servo Motors, Remote Control, Improved And Redesigned Color Sensor, Redesigned Touch Sensor, Infrared Sensor And 550+ LEGO Technic Elements Online in Japan. B016SF8GWY
Beacon tracking with LEGO Mindstorms EV3 IR Sensor - LEGO Reviews & Videos
LEGO EV3 REMOTE IR Beacon Sensor Seeker Infrared 45509 45508 USED $37.72 - PicClick