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Motor Speed Controler EM-114 Change the speed of your models DC motor smoothly from 5% to 95% with this kit. Operates from 3 to 6 Vdc at up to 0.5A. Learn about Pulse width modulation control of motor speed. Powered by two AA batteries (not included) or by 3 volt power supply. These kits includes illustrated instructions, battery holder, On-off switch, PCB and all parts. Size us 1.6" x 1.2" X 0.5"