NWT 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.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.Specific uses for product : Sports and Exercise 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, Charging time - 2 Hrs Active Noise Cancelling with Smart Ambient: Hear more of what you want, less of what you don't. Active Noise Cancelling technology with 2 microphones 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. 4 mics for perfect voice calls: Enjoy hassle-free, hands-free calls in stereo. The Tune 230NC TWS are equipped with 4 microphones, so you'll always be heard with perfect clarity. Never hesitate to take or make a call again..Note:If you face issue in Bluetooth connectivity please turn off the Bluetooth function for a couple of minutes. c