The product is an Air/Fuel Ratio Sensor made by DENSO, specifically designed for a 2.5L-L4 Nissan Altima from model years 2011-2013. It comes with a 1-year manufacturer warranty and is a single unit with the part number 234-9107. The sensor type is specifically designed for air/fuel ratio monitoring in the vehicle, providing accurate and reliable readings to ensure optimal engine performance. This product is a necessary component for maintaining the fuel system's efficiency and effectiveness in a Nissan Altima.