In January 2015, Tencent launched WeBank (China), China's first online-only bank.[57] On 30 January 2015, Tencent announced that it had signed a US$700 million deal with the National Basketball Association to stream American basketball games in China.[58] Later that year, Chinese automaker BYD became the chief corporate sponsor for Tencent's NBA broadcasts.[59] On 21 June 2016 Tencent announced a deal to acquire 84.3% of Supercell, developer of Clash of Clans, with US$8.6 billion.[60] In July 2016, Tencent acquired a majority stake in China Music Corporation.[61] In 2016, Tencent, together with Foxconn and luxury-car dealer Harmony New Energy Auto founded Future Mobility, a car startup that aims to sell all-electric fully autonomous premium cars in 2020.[62] On 28 March 2017, Tesla, Inc. announced Tencent had purchased a 5% stake in Tesla for US$1.78 billion, the automotive control systems of which it subsequently successfully performed penetration-testing until 2019.[15][63] In a "direct challenge to Chinese search engine Baidu," in May 2017 Tencent entered news feed and search functions for its WeChat app, which the Financial Times reported was used by 770 million people at the time.[64]