Enjoy deep bass, crisp highs and clear mids via 13mm dynamic speaker driver. [BT 5.0 and Quick pairing] : The Bluetooth 5.0 ensures stable connectivity, better wireless range and super quick pairing right out of the box. [Up to 20-hour playtime] : Air Buds offer a play time of up to 4 hours on a single charge and an additional 16 hours making a total play-time of up to 20 hours with the charging case. [IPX4 rated] : Now sweat it out without worry, thanks to the IPX4 water-resistant rating.