LED Power Display & 27H Playtime - Enjoy faster charging, to fully charge the rechargerable case only 1.7 hours via fast charge USB-C cable. The true wireless earbuds with digital power display show the remaining battery in percentage. KORSKR wireless earbuds with mic playtime lasts for over 9 hours from single charge and extend to 27 hours with 400mAh battery capacity charging case, and you don't have to worry about sudden power outage while traveling. Immersive Stereo Sound & Clear Calls - i07 wireless earbuds adopt unique stereo design and big dynamic drivers unit to produce powerful sound with more bass. Featured with dynamic treble, deep bass and carefully tuned sound, these in-ear bluetooth headphones bring you immersive 6D stereo sound, making you feel like in the centre of the stage. Mellow midrange, and clear treble(up to 20kHz) of the earbuds wireless reproduce your music vividly. AAC high-quality audio decoding supported.