Astro adapter. Its benefit is that it truly gives you the headset's power because the PS5 does not support the optical port. They released this piece to solve the problem. Of course, I advise anyone who has Astro A50 to get this piece because you really feel the difference. If you don't connect it, it's like you have a $20 headset. The optical port makes a real difference in the headset; you feel the difference immediately.