Tesla will begin selling and installing its solar roof later this year, the company wrote in its fourth-quarter investor letter.

Tesla unveiled its solar roof product in late October, about a month before the company acquired SolarCity in a deal worth $2.1 billion. Tesla CEO Elon Musk has said it looks "quite promising" that the solar roof could be cheaper than a normal roof, factoring in the price of labor.

Here's everything we know about the new solar roof product: