Æ?True Premium SoundÆ??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 Æ?Fantastic IPX7 SweatproofÆ??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. Æ?Perfect ErgonomicsÆ??ƒ??Enhanced ultra soft liquid silicone eartips that fit very well around your ear canals provide better comfort, retention, and noise isolation(up to 98% less noise). ƒ??Ultra secure ergonomic design for perfect lock in & wonƒ??t fall out. ƒ??4 pairs of eartips in different sizes (L/M/S/XS) for your best custom fit. Æ?Astonishing Full PowerÆ??ƒ??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. ƒ??The remaining battery power of the headphones will be showing on your screen-Thought for you! Æ?Extremely ConvenientÆ??ƒ?ÿBluetooth 4.1, go hands free and multi-task up to 33ft from your device, end and mute controls at your fingertips - Wireless Freedom! ƒ?­Support simultaneous pairing up to 2 devices. ƒ?½Magnetic earbuds design makes it more convenient to wear it,anywhere. ƒ?œACIL is composed of a leading group of audioprofessionals from Plantronics, Monster, and Harman aiming to producing best bluetooth headpones. Every ACIL product includes a 45 days money back & 24-month warranty