The sport headphones features LED illuminated neckband, advanced V4.1 and crystal clear sound effect, which is perfect for night runner or daytime workout. The two ear hooks adopts skin-friendly materials and ergonomic shape design to ensure secure and comfortable wearing experience. The CSR4.1 chip offers you wonderful sound effect when enjoy music and crystal clear hands-free call with high-sensitive microphone. 120mAh battery can lasts up 6-hrs playing time or 8-hr talking time after fully ch