Convenient Function 2 Select an external sound control mode. R [Adaptive (Auto-optimization)] is turned ON: It continuously adjusts to your ears and surrounding environment, ensuring that noise cancelling is always at its most effective level. (You cannot adjust the level of external sound control.) R [Adaptive (Auto-optimization)] is turned OFF: You can adjust the level of external sound control. Noise Cancelling: The closer to Max (100), the more noise is removed. Ambient Sound (Transparent): The closer to Max (100), the more external sound is transmitted. R [Ambient Sound] has Transparent and Attention modes.
If you select “Off” or “Ambient Sound” (Attention), you cannot adjust the level of external sound control. 48