AUSDOM&reg; Mini Lightweight Stereo Sports Bluetooth Earphones S09, Sweatproof Headsets Noise-isolating Headphones with Built-in Microphone for Iphone, Android Smartphones, Ipad, Tablets Bluetooth 4.1 high-quality and lower power-consumption chip In-ear earplug design & ear-hook design with build-in microphone and hands-free Drive-by-wire function make it more easy to control the voice volume and music playing. Over 5 hours of continuous calling and playing time, 200 hours standby Including 3 different size of silicone earmuffs super comfortable, perfect for working out or any other activity.