bluetooth 5.1 technology: wireless headphones adopt the most advanced bluetooth 5.1 technology, 2x faster transmission speed than the old Bluetooth 4.2 wireless earbuds, to ensure more stable connection, lower latency and lower power consumption during data transmission. making music playback and conversations smoother and clearer, bluetooth earbuds it doesn't disconnect even in the crowded subways environment. superior stereo: bluetooth headset latest cvc 8.0 noise cancellation technology, features immersive stereo sound with balanced highs and bass, the sound of is not only full and warm but nicely detailed. so noise cancelling headphones that you can have clearer and stable calls. even in a loud environment. high clarity and deep bass immerse you into the wonderful music. 30h playtime and individual power display: portable charging box with that supply 30hours playtime, bluetooth headphones can play for 5 hours once fully charged. bluetooth earphones charging only takes 1 hour and charging, wireless headset battery separated led display design, it will display how much battery remaining in the charging base when putting into the case, you can know when is the best time to charge. one step pairing and touch control: noise cancelling earphones would automatically connect to each other once you pick them out of the case, in a matter of seconds, you are in euphonic music world. stereo sound earbuds adopt touch control technology, the touch button can help you easy to achieve multiple functions, include control media and calls, track forward, back, play, pause, volume , volume, siri enable and answer, reject calls. ergonomic design and ipx7 waterproof : sport headphones equipped with 3 different sizes of soft silicone earbuds and adopt three point support design to ensure wear comfortable, safe and stable. with ipx7 technology waterproof earphones, you can wear it to endure and work flawlessly under different weather condition, perfect for sports running, cycling, climbing, yoga, fitness, travelling.