AUSDOM Fashion Stereo Sports Headphone bluetooth 4.1 headsets for Sweatproof Smart Headsets with Built-in Microphone for Iphone, Android Smartphones, Ipad, Tablets Bluetooth 4.1 ,lightweight shape ,more portable smart earphone. Dynamic and fluent modeling design,specially designed for sporty,rock your heart. About 8 hours of continuous calling and playing time, and 200 hours standby. More choice to be suitable for u ,3 different sizes earplugs, Satisfy your requirements. Frequency response equilibrium technology keeps it transfer more quickly, lower power consumption.