Tesla has launched the company as of December 31, 2019 in the fourth quarter of the financial statements. We also landed on the roof with housing construction and other industries, such as the north American market, the annual order quantity is 4 million new roof. Results after the release, tesla CEO elon & middot; Musk ( Elon Musk) , chief financial officer, zack & middot; Kirk horn ( 扎克。 ) , chief technology officer of straw bale ( 巴顿施特劳贝尔说) And investor relations director Martin & middot; D check ( Martin Viecha) Attended the earnings call, solar portal, and answered the questions, an analyst on site. Photovoltaic modules connector results show that the tesla total revenue in the fourth quarter of 73. 8. 4 billion dollars, up 2% from a year earlier. Freiburg solar city as a result, solar net, we see everyone is interested in solar net, so the question becomes, how do we find the right setup, how to train our staff how to do it. Analyst: California, given all the construction of new housing requirements include solar system, solar photovoltaic (pv) network, do you have received from California large building construction company ( KBHomes, etc. ) Order of, a large number of glass solar roof? Could you share some relevant information? You in California in 2020 glass solar rooftop installations have any goals? As time went on, I predict, will have a large percentage of new roof using solar roof. Back of the wardrobe loose elon & middot; Musk: do we really have to see the glass solar roof of growing demand, it is difficult to specific predictions, but the demand is very big. Back of the wardrobe pine is a kind of choice, do you want to choose & other; Die & throughout; Without the energy, the roof of or & other; Live throughout the &; Can produce energy roof? I think people will choose & other; Live throughout the &; Can produce energy, the roof of their quality, the vehicle controller is very durable, this is everybody is looking forward to the future. However, the products are relatively new, more innovation, we need to overcome many challenges. But we will overcome these challenges, therefore, solar energy, solar energy will become one tesla's main business.