MARSEE Bluetooth Headphones Wireless In-ear Headsets Sweatproof Sports Running Jogging with CSR Bluetooth 4.1, aptX Stereo Pure Sound, 6 Hours Play Time Lighter Weight and More Comfortable: MARSEE one X total weight only 12.7 gr(0.44 oz),firm ear hooks design for reduced vibration/movement,perfect for a quality and comfortable fit for greater stability during exercising, including running, cycling, workout or normal activities. Aluminum Shell: Design with metallic luster aluminium,made MARSEE one X more than a headphones. Bluetooth 4.1 + aptX: Bluetooth 4.1 offers a faster, more energy efficient connection so you can listen to music for up to 6 hours, and hear richer and more natural sound from your smartphones, tablets, and audio devices with the aptX codec Sweatproof and Weatherproof: Made to withstand the intense heat and sweat of exercise, and even jogging in light rain Excellent Battery Performance: Up to 6 hours of continuous music time with a single charge,enjoy the balanced bass and natural treble