SWEAT IN STYLE: The winner in sports audio features innovative sweat proof covering TOP QUALITY AUDIO: Hear richer and more natural sound from your smartphones (including iphone 7), tablets, and audio devices with the aptX code. LAST LONGER, SWEAT LONGER: Bluetooth 4.1 offers a faster, more energy efficient connection so you can listen to music for up to 7 hours. All TaoTronics Bluetooth Headphones should be charged by DC 5V charger. CRYSTAL CLEAR COMMUNICATION: Featuring CVC Noise Cancellation technology, the integrated microphone lets you chat without external noise or other interference.