bose soundsport free wireless sport headphones - 774373-0010 black (renewed) bose truly wireless sport headphones for total freedom of movement, packed full of technology that makes music sound clear and powerful earbuds are sweat and weather resistant (with an ipx4 rating) and come with 3 different pairs of stay hear+ sport tips (in sizes s/m/l) that provide a comfortable and secure fit up to 5 hours of play time with each charge and an additional 10 hours with the included charging case and also features a charging time of 2 hours track lost earbuds with the bose connect app's "find my buds" feature firmware update to improve audio video synchronization for customers using iphones, ipads and other bluetooth devices that support avdtp version 1.3 or later, available via connect app. connectivity technology: wireless bluetooth soundsport free headphones have an integrated dual microphone array located on the right earbud to allow you to use them during calls when connected to a smartphone that supports bluetooth. call audio will only be heard in the right ear bud