Gotek SoundTube earbuds adopt Bluetooth 5.0 Realtek chips to ensure MORE STABLE bluetooth connectivity; MORE SMOOTH transmission(up to 49 feets); SMARTER pairing method with automatic re-connection function and lower power consumption. Enjoy the stereo phone calling experience: we used advanced acoustic technology to achieve dual stereo reception! Our earphones has 6 hours playback time, and it can be powered extra 4 times by charging case with 450mAh battery capacity. Superior sound quality provided by powerful 8mm Audio Driver. Gotek SoundTube has IP67 level of dust & waterproof protection. IP67 means the unit can be dropped into a body of water up to a meter deep for half an hour, nano coating effectively prevents damages from dust, sweat, rain and water immersion. SoundTube Earbuds ergonomic design provides passive noise cancellation and prevents earbuds from falling off no matter what while you are running, jogging or exercising. They come with 3 different sizes of extra eartips to meet different customers' demands. Touch control technology makes your music experience even more comfortable: just tap your earbud to change music, play/stop or receive a call.