Tesla Motors’ cars will come fitted with full self-driving hardware, as the company jousts with tech rivals like Google and car makers like Ford that are making a dash for the autonomous car market.

Model S and Model X cars with the inbuilt hardware are already in production and customers can buy one, Tesla said Wednesday. But the features possible with the new hardware will be enabled only later through over-the-air updates after testing more than “millions of miles of real-world driving,” Tesla added.

The company is not taking chances after fatal accidents involving Tesla cars in China and Florida raised questions about the readiness of autonomous technology. In the Florida instance, it was confirmed that Tesla’s Autopilot technology for driver-assistance was activated, while in the China incident, Tesla said it didn’t have sufficient data to establish that the technology was engaged.

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