Always ready to use Is there anything more useful than completely wireless headphones with a charging case that fits in the pocket of even the skinniest jeans? These splash- and sweat-resistant headphones fit snugly in the ear and provide great sound and up to 18 hours of listening time. Is there anything more useful than true wireless headphones with a charging case that fits in the pocket of your slim-fit jeans? These splash- and sweat-resistant headphones give you a secure in-ear fit, great sound and up to 18 hours of play time.