The location and color of the power indicator differs depending on the product. For details, refer to the manual supplied with the product.
Ex) WH-1000XM2 power indicator location
The headset is turned on normally.
Blue and red indicators flash alternately/Blue indicator flashes twice at a time
The headset is in Bluetooth pairing mode. When using the headset for the first time after purchase, or when turning it on after initializing, it will automatically be in pairing mode, so you can connect to the Bluetooth device that you want to.