Check the listing for details. DIY SIMPLE MOTOR W/OPTICAL CONTROL KIT #7 SCIENCE FAIR PROJECT ELECTRICITY DI. Condition: New. Listed at 33.95 USD. DO IT YOURSELF !!!SIMPLE MOTOR KIT MOTOR WITH OPTICAL CONTROL - KIT # 7 Motor using optical interrupter as a sensor.This is quiet, reliable but a little slower motor. THIS MOTOR USES STANDARD AA SIZE BATTERIES (NOT SUPPLIED). INCLUDED JUMPER WIRE ALLOWS TO EXPERIMENT WITH 3 DIFFERENT VOLTAGES: 3, 4.5 AND 6 VOLTS. SOLDERING IRON REQUIRED FOR ASSEMBLY. BASED ON AWARD WINNING PROJECT GREAT FOR SCIENCE FAIR PROJECT, HOMESCHOOLING, SCOUTS MEETING, BIRTHDAY PARTY, ETC. - YOU NAME IT! OUR MOTOR KITS PROVIDE LOTS OF FUN AND GREAT LEARNING EXPERIENCE PERFECT EDUCATIONAL TOOL TO LEARN BASICS OF ELECTRICITY, MAGNETISM AND ELECTRIC MOTORS. WE HAVE IT ALL! DETAILED ASSEMBLY INSTRUCTIONS PROVIDED ONLINE FOR EVERY MOTOR KIT. PLEASE CHECK OUR OTHER MOTOR KITS