COULAX Bluetooth Headphones V4.1 Wireless Sports Headset with Mic/APT-X and Memory Metal Ear Hooks for iPhone, iPad Pro, Android Unique Ear Hook Design: Ergonomic optimized design, flexible adjustment for memory metal ear hook sizes, shape and angle. Dedicated sports music ear caps make us more secure and comfortable to wear Green Metal Casing and Waterproof Soft Plug: Aluminum oxide metal combines with high-end polycarbonate and coats with anti-hang matte UV that strengths wear and scratch proof, and increases 200% texture Perfect Hi-Fi Sound Quality: CVC 6.0 Noise Cancelling inhibits background noise that maintaining the crystal quality sound and deep bass for your music. APT-X audio decode tech provides you high stereo music experience with deep bass in noisy environment Advanced Bluetooth Technology: Bluetooth V4.1 CSR headphones strengthen the signal are twice times stronger than the common one. Supporting 33ft (10meters) working range. Compatible with 99% of all Bluetooth capable devices, allows pairing with two mobile devices simultaneously Excellent battery performance: A built-in 90mAh lithium-ion polymer battery boasts 250 hours of stand-by operation or 7~8hours of play/talk time. Businesses use benefit from this extended battery performance