Some 3/4 scale Arcade1up cabinets come with a light up marquee and either a lit control deck or lit coin door slots.

Those arcades come with a splitter cable so that 2 lit things can be powered at once.

This is a replacement if yours is lost or missing or you just want to add something that your arcade didn't originally come with.

It has one small male plug that goes into the PCB and two small female plugs for lit accessories.