Electric motor : 3 to 27V DC. 3V at about 1 revolutions per minute. 4V at about 2 revolutions per minute. 5V ~ 3 revolutions, 6V ~ 4, 1/4 revolutions, 7 V ~ 5,5 revolutions, 8V ~ 6 3/4 revolutions, 9V ~ 8 revolutions, 10V ~ 9 revolutions, 11V ~ 10 revolutions, 12V ~ 11 revolutions Diameter of the Outer Coil ~67mm Diameter of the Inner Coil ~60mm Wire diameter ~2 mm Housing with motor, gear and variometer: Overall dimensions: - length ~ 203 mm (~ 7.99 inc). - width ~ 90 mm (~ 3.54 inc). - high ~ 83 mm (~ 3.23 inc). Weight: ~ 1.1 kg. Shipping Shipping worldwide by Registered Air parcel with Tracking number. Your item will be shipped within 1-2 business days once payment received. Items are shipped from Ukraine using Airmail, reach most of the countries within 15-20 business days. Delivery time depends on destination, how quickly the package goes through Customs and other factors, it may takes up to 20 business days. P.S. to Europe about 10 days (to ITALY about 30-40days)