Alpine High end AiNet unit from around 1995 3 optical inputs, 2 optical out, controls for an Ai-NET CD changer and slave unit as well.
This particular one looks to be NIB and never been mounted in a car , comes with fibre optic cable and power extension cable which have never been opened and in sealed packages still , also comes with AiNet extension cable.
The manual is missing but PDF copies readily available on the net .The cardboard box itself is fine on one side but has been ripped and taped together on the other side , can be seen in pictures.