Superb Sound Quality.Bluetooth 5.3 bringing you stereo sound quality and superb bass sound. Clear high & low volume. Best wireless earbuds with richer and crisp sound. Built-in mic with voice notification of incoming calls.Also we have upgraded the bluetooth name from "Otium" to "U18", it will more conveniently to search and connect with the headphones. IPX7 Waterproof Headphones.Otium workout Bluetooth earbuds with IPX7 sweat/waterproof, 100% protects Sport headphones from sweat. Great for running, jogging, hiking, yoga, exercises, gym, traveling. Up to 16 Hours playing time.16 hours Music playing for full battery charge with improved lithium polymer battery. 1.5 hours Super quick charge time with full charge light indication. The Headphone battery status will be automatically displayed on the phone screen. Enhanced Comfort & Secure Fit.Four different sizes of eartips (XS, S, M, L), one optional wire clip and soft silicon earhooks, ensure comfortable and secure wear in even most intense workout. A carrying case is provided for better portability. Foolproof Operation.Allows Skip/Play/Pause on your music tracks as well as all phone use without reaching your phone.