Anbes Ultralight Bluetooth Headsets Bluetooth 4.1 Wireless Stereo Earbuds Running Gym Exercise Earphones with Removable Replaceable Batteries,Built-in Mic for Smartphones (Black+Blue) POWERFUL REMOVEABLE BATTERY:Built-in polymer lithium battery which can be replaceable by another one which up to more than 150 hours of stand-by,over 4 hours of talk time,over 5 hrs of listening time,and less than 2 hrs charging time. Provide you less time charging and more time for enjoying HD STEREO SOUND:CVC6.0 noise cancellation and noise reduction, to ensure comfortable and clear speak. Let you get Hi-Fi stereo sound even in noisy environment like inside a gym and running/cycling on the road BLUETOOTH 4.1 TECHNOLOGY:This earbuds with most advanced bluetooth4.1 chips hardware configuration ensure data transmission become more faster and stable EASY TO USE: Portable function buttons are designed for easily operation.Press it until BLUE and RED LED light alternatively flashing, find and connect with your phones,then you can enjoy music or calling wireless SUPER COMPATIBILITY:Universal Compatible for Apple iPhone 6 6 Plus 5 5S 4 4S iPad iPod Samsung Galaxy S6 S5 S4 S3 LG Motorola Sony and iOS/Android Mobile Phones. Almost all smart phones can work with this well