The talk was about the Polyvent Free Libre Open Source ventilator, which is an open source hardware device designed to help with the COVID-19 crisis. The speaker discussed the background of the project and the challenges of creating open source medical devices. They highlighted the features and improvements made to the Polyvent ventilator, including a modular design and extensible electronic control system. The speaker also mentioned the development of the VentOS software, which runs on an ESP32 and is used to control the ventilator. They emphasized the importance of creating a respiration ecosystem and developing standards for the field of medical respiration. The goal is to democratize the field and make open source hardware more accessible in the healthcare industry.