Electra Pop: The chassis is lightweight and rugged, made of Industrial Polymers. The engine is Japanese 3.5 watt with steel brass at the end of the rod. (Not a motor with bearings). The ideal operating voltage: Minimum of 6 volts and maximum of 12 volts. (Voltages above or below stipulated can cause damage to your motor). The machine plug is RCA (Cable Not Included) The machine is not the same as the classic Electra aluminum and does not have the same engine. They are different machines with similar designs. The Electra Pop is only 5mm Greater in circumference than the Electra Classic Aluminum. Machine Cursor: 3.3mm Warranty: 6 months