The LED is a handy little tool to indicate a few things on your headset. Here's what each color means:
Solid Green: The battery is 50-100% full
Solid Yellow: The battery is 20-49% full
Solid Red: The battery is 10-19% full
Blinking Red: The battery is 1-9% full
Blinking Blue: You are connected to Bluetooth
Blinking White: Your headset is currently trying to pair to the Xbox
Fast Blinking Rainbow: You may be having a lucid dream about the 9X because this is not something it can do pls wake up