Adjust the headband for a perfect fit.
Put the earpiece marked with L over your left ear and the one marked with R over your right ear.
When you put the headset on, the earpiece proximity sensors switch active noise cancellation (ANC) on automatically.
If you're not wearing the headset for 10 minutes, ANC switches off, and the headset mutes itself to save power. To carry on using the headset, just put it back on your head.