Tim Cook was asked about Vision Pro's sky-high price tag. He pointed to the 5,000 patents inside.

• Apple's new Vision Pro hits stores Friday amid a wave of optimism from the company.
• The product costs $3,500, but sold out pretty much immediately.
• When asked about the price tag, Apple CEO said the device includes 5,000 patents. 

Apple's new mixed-reality headset's $3,500 price tag may be steep, but it accounts for the sheer amount of technology included inside, CEO Tim Cook told analysts during an earnings call Thursday.