Honeywell International is a software-industrial company that invents and commercializes energy, safety, security, productivity, and global urbanization technologies. It operates through four segments: Aerospace, Honeywell Building Technologies, Performance Materials and Technologies, and Safety and Productivity Solutions. The Aerospace segment supplies propulsion engines, environmental control systems, integrated avionics, electric power systems, data and software applications, and other products and services for aircraft. The Honeywell Building Technologies segment offers software applications for building control and optimization, as well as sensors, switches, control systems and instruments, video surveillance, fire products, etc. The Performance Materials and Technologies segment develops and manufactures performance chemicals and materials, process technologies, and automation solutions. The Safety and Productivity Solutions segment provides personal protection, gas detection technology, emergency messaging, and other solutions.