PRE-ASSEMBLED DC MOTOR, 1.5V or 3V DC • DC motor with open structure operates on a 1.5V battery or 3V DC power • Change direction of rotation by reversing magnet’s polarity • Use with rheostat to observe the change of speed with the change of current • Unit can stand vertically or horizontally • Includes: small screw driver, wrench, sturdy plastic storage case, and instructions with student activities