HiTechnic color sensor - for Lego Mindstorms EV3 Botland - Robotic Shop
7. using the color sensor - The LEGO MINDSTORMS EV3 Discovery Book (Full Color) [Book]
Amazon.com: 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 : Toys & Games
Amazon.com: Lego Mindstorms Ev3 Color Sensor : Toys & Games