The Chinese e-commerce platform Pinduoduo has partnered with the agency Beijing Dentsu to launch an app that detects cooking sounds and rewards users with coupons for cooking oil. The app works when activated or in the background to perceive the sizzling of the cooking oil, whether the sound comes from the kitchen at home, the TV, a restaurant or the street. A coupon is then generated in real time. Users can redeem the coupons with Pinduoduo to purchase some cooking oil. The app uses a previously untapped data source and combines it with sound recognition.