Sundix (TM) Wireless Bluetooth Headphone with Built-in Microphone Sweatproof Sports Running In-ear Music Stereo Neckband Headset for iPhone iPad/iPod/Smartphones/Tablets/Android (Black) Cozy Design: Unique ear hook, flexible & soft as cotton, goes over your ear in greatest comfort, superior to most ear hook earphones as for long-term wearing. Super Quality: Combined with CVC6.0 digital noise cancelling tech produce excellent audio, HD microphone allows callers enjoy a high fidelity and clarity sound quality. High-tech: Improved Bluetooth 4.1 technology, reliable wireless connectivity within 33ft. Long Standby Time: equipped with Li-ion battery, it has a max 8h of all-day music streaming, with almost non-stop use. 100% Satisfaction Guarantee: Purchase from Sundix can enjoy 1 year warranty, a free replacement and full refund for not man-made problems.