MOTOR/COLOR WHEEL DEMONSTRATION, 4 - 6V • This unit can be used with both electrical and optical Physics demonstrations • Open model shows all the parts of a motor with removable bar magnet • Operates on a 4 to 6 V DC, 2 t0 3 amp power supply • Size: 5” x 3” x 4½” (128 x 80 x 115mm) • Color disc included