Two microphones on each earbud pick up and clearly transmit your voice while eliminating ambient noise. So you can have clear calls even when you're taking a walk in a noisy park with a breeze. Use the JBL Headphones app to select an EQ that suits your style, or customize your own. Voice prompts in multiple languages provide you with helpful information, such as if the battery is low. Or, in Relaxation mode, choose from five sounds of silence, like gentle ocean waves or a crackling log fire, to unwind and recharge.