The ATH-CKS30TW+BK are True Wireless Active noise cancelling earbuds. These pocket-sized truly wireless headphones offer high resolution sound for realistic music and movies. For beats that make your whole body move activate the ultra-low-frequency equalizer to enjoy the richest depths of your music. Enjoy up to 6.5 hours of use from each earbud when fully charged even with noise-cancelling turned on or 17.5 hours of use with both the headphones and charging case fully charged. Turn noise cancelling off to get up to 7.5 hours of use from each earbud or 20 hours of use with the charging case. Taking you from morning workouts to evening relaxation these securely-fitting waterproof earbuds feature a snug fit to keep the bass intact and feel comfortable all day and should they ever be misplaced our handy Out of Range Alert keeps you in the loop.