Bluetooth Headphones – Dual Drivers Wireless Earbuds, Balanced Armature, 0.4" Dynamic Driver, Superb HiFi Stereo, 12H Battery, Noise Cancelling, Sweatproof, in-Ear Headphones with Built-in Mic Fantastic IPX7 Sweatproof for Sports】ACIL IPX7 Water-resistant Nano-coating efficiently protects sport headphones from sweat & rain, ensuring necessary durability for strenuous workouts and weather, perfect for running, jogging, hiking, gym, fitness and etc. 【98% PASSIVE NOISE CANCELLING】 Noise cancelling tech completely blocks out the outside noise from music. Nothing between you and music. Bluetooth headphones come with 4 pairs of earpieces in different sizes which is comfortable to wear for long time. 【True Premium Sound】Equipped with advanced Knowles Balanced Armature Drivers, ACIL bluetooth earbuds deliver the best in true wireless audio with improved fidelity, realism and detail over traditional ones. Enjoy a new level of clarity with ACIL, You Try Then You Knew It. 【Astonishing Full Power】Improved lithium polymer battery brings up to 10 days of standby time and 11~12 hours of music time（at 50% volume), with a quick charge of only 1.5 hours. The remaining battery power of the headphones will be showing on your screen-Thought for you. 【Extremely Convenient】①Bluetooth 4.1, go hands free and multi-task up to 33ft from your device, end and mute controls at your fingertips - Wireless Freedom! ②Support simultaneous pairing up to 2 devices. ③Magnetic earbuds design makes it more convenient to wear it anywhere.