Nanjing DeFi Software Technology Co., Ltd. (DeFi for short) is a creator and supplier of interactive floors and wall systems for presentation, advertising and entertainment systems. DeFi gives media companies, advertisers, event and exhibition organizers the ability to display digital contents in various public locations, including museums, science centers, amusement parks, tradeshows, retail locations, bars & nightclubs, real estate presentation centers, corporate showrooms, boardrooms and ...