Original Apple, fully tested interconnect board for the PowerBook 160, 165 and 180 models. This also contains both the internal microphone and speaker. This board is used to connect the top half of the machine to the daughter board via the integral interconnect cable. It also has both sockets for the keyboard, display cable and DC/DC converter board.
Note: It also contains the PRAM battery cell but this will no longer hold charge so settling like date & time, and startup disk will be lost when the power supply is removed.