Offers playback time of up to 8 hours for every charge. Carrying case can give 4 additional charges to the earbuds making total play-time of up to 32 Hours [IPX5 water resistant]push your limits as the IPX5 water-resistant rating takes care of the water and sweat. Make the most out of every moment and keep in touch with your world in style with the Boult Audio AirBass FX1.One Button Control & Voice Assistant: With one multifunction button, you can play/pause, previous/next track and answer/hang-up calls.Voice assistant function lets you access siri/Google Assistant. 20m Transmission Distance. 9mm Driver Size.