Elon Musk unveiled Tesla’s highly anticipated self-driving taxi at a flashy Burbank event that was light on specifics, leaving investors questioning how the carmaker expects to achieve its ambitious goals.

The CEO showed off prototypes of a slick two-door sedan called the Cybercab late Thursday, along with a van concept and an updated version of Tesla’s humanoid robot. The robotaxi — which has no steering wheel or pedals — could cost less than $30,000 and “probably” will go into production in 2026, Musk said.

The product launch, held on a movie studio lot, didn’t address how Tesla will make the leap from selling advanced driver-assistance features to fully autonomous vehicles. Musk’s presentation lacked technical details and glossed over topics including regulation and whether the company will own and operate its own fleet of Cybercabs.

As Jefferies analysts put it, Tesla’s robotaxi is “toothless.”

The underwhelming event sent Tesla’s shares tumbling as much as 10% Friday in New York, the biggest intraday decline in more than two months. They were down 7.6% at 12:29 p.m., wiping out $58 billion in market value. The stock had soared almost 70% since mid-April, largely in anticipation of the event.

Tesla has a track record of blowing past timelines Musk has offered for all manner of future products, and has had a particularly difficult time following through on his self-driving forecasts. The CEO told investors in 2019 that Tesla would have more than 1 million robotaxis on the road by the following year. The company hasn’t deployed a single autonomous vehicle in the years since.

“The only specific was the $30,000 for a Cybercab,” said Nancy Tengler, the CEO of Laffer Tengler Investments and a Tesla investor who attended the event. “The concepts were all great. Is the idea super cool? Absolutely.”

Tesla has for years been selling a suite of features it’s marketed as Full Self-Driving that require constant supervision and don’t make its vehicles autonomous.

Musk said Thursday the company expects to be able to allow Model 3 and Model Y owners in Texas and California to no longer need to monitor those features sometime next year.

Among the others revealed at the event were a futuristic-looking Robovan concept that Musk said could transport as many as 20 people, plus new versions of the humanoid robot, Optimus. While the CEO offered a rough sense of when the Cybercab may be ready, he didn’t say when Tesla will make the Robovan.

“Investors we spoke to at the event thought the event was light of real numbers and timelines,” RBC Capital Markets analyst Tom Narayan said in a note. “We would expect shares to trade lower.”

The robotaxi event itself was postponed for two months after Musk ordered changes to the prototype’s design, Bloomberg first reported in July. The Cybercab features doors that open upward like butterfly wings and lacks a steering wheel or pedals.

“They nailed the form factor,” said Gene Munster, managing partner of growth-investment firm Deepwater Asset Management, who went for a ride in one of the prototypes. “But the investor reaction is probably going to be muted because it’s still a long ways away, in terms of the time frame.”

Musk told the crowd gathered at a Warner Bros. Discovery Inc. movie studio lot that consumers will be able to buy the Cybercab, then offered a hedged answer when an attendee asked when it will be available.

“Probably, well I tend to be a little optimistic with time frames, but in 2026,” Musk said. “Before 2027, let me put it that way.”