Tesla is set to unveil its $35,000 Model 3 electric car on March 31, and today it revealed a few details in invitations sent to the media. The company plans to unveil a working prototype on site. A full car isn't expected to go on sale until 2017 at the earliest.

In invitations sent by the company to current Tesla owners, provide a first glimpse of the design of the car, which was previously described the car as similar in size to the Audi A4. Tesla has described the car as being roughly 20 percent smaller than the Model S.

The event will be held at the Tesla Design Studio in Hawthorne, Calif.

With the new model, Tesla wants to bring the success of the Model S in luxury markets to a much wider audience. The company's previous cars have missed their production deadlines, but Tesla has said it has learned from past mistakes and is focused on getting an affordable Model 3 on the road as soon as possible.