JBL Pure Bass Sound: Smartly designed 10mm drivers enhanced by the Dot form factor deliver JBL's Pure Bass Sound so you'll feel every pulsing beat. | Product Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ears | Active Noise Cancelling with Smart Ambient: Hear more of what you want, less of what you don't. Active Noise Cancelling technology with 2 mics lets you minimize audio distractions. With Ambient Aware, you can tune into your surroundings at any time so that you feel safer when you're out in the world, while TalkThru lets you stop for a quick chat without having to remove your headphones. | 5 mics for perfect calls: Enjoy hassle-free, hands-free calls in stereo. the Tune 130NC TWS are equipped with 4 microphones, so you'll always be heard with perfect clarity. Never hesitate to take or make a call again. | Up to 40 hours of battery life: Never miss a beat with 40 (10 plus30) hours of battery life or 8 hours, plus 24 hours in the case when noise cancelling is engaged. Need a boost. Speed Charge for just ten minutes to get 2 hours of playtime. Dynamic frequency response range (Hz) 20 Hz - 20 kHz | Water resistant and sweatproof: Don't be deterred by bad weather. Thanks to IPX4 water resistance and sweatproofing, there isn't a workout or downpour the Tune 130NC TWS can't handle.