Mpow Seals Airflow Sports Bluetooth 4.0 Back Head Headphones with CVC 6.0 Noise Canceling & aptX Technology Aerodynamics Stylish Design : The airflow surface of Mpow Seals is in accordance with the curve of the external ear, making you super comfortable while enjoying your exercises. IPX4 Waterproof Level : When we say IPX4 waterproof level, we mean it can resist any drops or splashes of water from multiple directions. It is made for sports. CVC 6.0 & apt-X Technology : apt-X technology, coupled with 6th generation CVC, you will never miss a beat and enjoy a crystal clear voice talking. Excellent Battery Performance :Up to 7 hours of continuous talking / music time and up to 240 hours of standby with a single charge, saving more time for fun! 20-Foot cord