360&deg; Stereo Bluetooth Version 4.1 Bluetooth Headset Headphones Lightweight Sweatproof Neckband Wireless Music Sports Headset for Running & Gym & Exercise & Driving - Hands-free (Black) 1.Bluetooth standard V4.1 sport stereo headphone. Noise-cancelling microphone reduces background noise.Crystal Clear Sound Quality: This elaborately designed master piece provides an exquisite sound quality regardless of which tune you set it to. 2.Comprehensive Compatibility and Steady Connection: Supports almost all of the blue tooth devices in the market including cellphones, computers and sound systems. Up to100% compatibility. With the steady connection there is no need to worry about conne 4.Scientifically design with soft and light material to take out the pressure and maximize comfort for your ears. We provide many different sizes of earplugs to guarantee that you can enjoy the maximum comfort. 5.Delicate Design And Simple Operation: Stylish magnetic adsorption design with around the neck fashion. Full navigation with just a touch of the button beside your ear. 5.Wearing without pressure: Professional in-ear structure provides you the best fit. In addition, it is available in 4 different versions for different ear shapes. Everything is for your comfortable wearing experience.