Is this gaming headset compatible with ps4/5?
Yes,
It works well with most devices with a 3.5mm audio jack, like PS5/ PS4 / Xbox One/ PC/ Mac/ Nintendo 3DS/ PSP/ Laptop/iPad/Computer/Mobile Phone etc.
How do I make the headset light up and work at the same time?
If your device does not come with a USB input, you can link the USB plug to a power bank, computer, or other USB charger.
How do I use a 3.5mm audio splitter?
This is for use with PC or laptop only. The red connector plugs into the microphone port and the green connector plugs into the speaker port.