Vtin Moul Series Bluetooth Sports Headsets Compatible with Android & iPhone Devices Secure Fit. Taking the different ears into consideration, the over-the-ear hooks can hold the earbuds firmly onto your ears for secure, stable and comfortable fit. No worrying about falling out when exercising. The included various sizes of ear tips are ready for most ears. Extended Battery Life. With high performance polymer-lithium battery, the wireless sport headphones allow 5.5 hours music playing time and 168 hours stand-by time. Suitable for Gym, Hiking, Cycling, Jogging, Climbing, Driving etc. Tailored for Sport. Equipped with two types of semi-closed ear tips, which is the unique ear tips designed for sport, it can reduce the "Microphonic Effect", like the noise caused by the friction between cable and clothes. The included buckle helps you manage cable length and get better sound experience. High Stereo Sound. With high quality FI10 drive and APT-X profile, the VTIN headphones provide you astonishing sound with rich, deep bass. CVC 6.0 noise-cancellation technology and the built-in Mic offer you super clear speeches easily. Bluetooth V4.1. Advanced Bluetooth 4.1 technology allows you to connect two Bluetooth-enabled devices simultaneously. The working distance reaches up to 33feet and it supports IOS system power display.