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Reflective Optical Sensor, http://www.kingbright.com/attachments/file/psearch/000/00/00/KRC011(Ver.15).pdf Subminiature Reflective Optical Sensor Photointerrupter infrared LED with right dot One digit 7 segment LED display in red, yellow or green colour http://www.kingbrightusa.com/images/catalog/SPEC/sa39-11ewa.pdf One digit 7 segment orange LED with right dot One digit 7 segment green LED, http://www.kingbrightusa.com/images/catalog/SPEC/CA56-12EWA.pdf 4 digit 7 segment LCD 6 digit 7 segment LED display Dubble digit super bright yellow LED display 3 1/5 digit LOW BAT + 7-Segment LCD 3 1/5 digit reflective LCD LOW-BAT + 7-Segment 4 digit 7 segment LED display Double digit seven.