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motor direction controller EM-115 Motor direction control (EM-115) takes signals from the sound receiver EM-106 , or visible/infrared light receivers EM-107 and EM-108 (or most any logic level signal) and electronically reverses the motor's direction. 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"