Guests and journalists take photos of Mavic Air and its accessories during a launching ceremony in New York, the United States, Jan. 23, 2018. Civilian drones producer DJI released it latest product Mavic Air here on Tuesday. Mavic Air is an ultra-portable and foldable camera drone with a 4K high quality camera and has a maximum flight time of 21 minutes. (Xinhua/Wang Ying)