Levin Wireless Bluetooth 4.1 Headphones Outstanding Stereo --- Equipped with a CSR4.0 noise-canceling technology, provides an excellent sound quality. Ideal for runner. Unique Design --- 270-degree rotated design, suits both the left ear and right ear, helps to relax your ear for long time listening. Excellent Performance --- Fully charged for 1.5 hours. It is available for 8 consecutive hours talk. Standby time is reached 300 hours. Comfortable Fit --- Come with soft materials of ABS, in a adjustable flip-boom arme. Comfort your ear, painless for long time use. More Surprise --- If for any reason you are not satisfied with it, please contact us. Our excellent customer service will make things right!