The product is a 2003-2004 Toyota Corolla Automatic Transmission Engine Control Unit (ECU) with the manufacturer part number 89661-0Z091. It is a flash memory type ECU that requires programming. The ECU is designed specifically for Toyota vehicles and comes with a 1-month manufacturer warranty. It includes a protection lock feature and is an interchange part for models from 2003 to 2004. This ECU is not a universal fitment and is not considered a vintage or performance part.