The 2-speed battery motor is an electric motor which includes an integral 6v power pack. The power pack has a three-way switch allowing the motor to be run in either direction, plus a second switch will allows the speed of the motor to be set to "slow" or "fast".
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The 2-speed motor is larger and more powerful than the usual K'NEX battery motors. The motor requires four AA batteries (not supplied).
The 2-speed motor is easy to attach onto K'NEX models, via the projecting lugs on each side of the motor.
The photo shows an example of attachment.