Founder Elon Musk said the new version of the Model S will feature the letter D for dual motor, one of which will be in the front and one in the back of the vehicle. Musk unveiled the new car at an event at Hawthorne airport in Los Angeles where Tesla has a design studio and engineering lab. Musk said the new car will come in three versions: 60D, 85D and the top of the line P85D, with progressively higher engine power and speed.

The P85D will be delivered in North America beginning in December, while the 60D and 85D will be delivered starting in February. Deliveries in Europe and Asia will come in the months to follow, Tesla said

Electric cars represent only 3.5% of sales in the US but that stake is growing. Tesla last month announced plans to build the world’s largest lithium-ion battery plant in Nevada, as part of an effort to bring down costs and boost popularity of electric vehicles.