This is a used Mazda Transmission Control Module (TCM) or Transmission Control Unit (TCU) with OE/OEM part numbers LF8M189E1H, LF8M-18-9E1A, LF8M-18-9E1C, LF8M-18-9E1D, LF8M-18-9E1. It is a direct replacement for the original unit and comes with a manufacturer warranty of 30 days. The TCM/TCU is manufactured by Continental and is designed to control the transmission of Mazda vehicles.