Truly wireless headphones with Bluetooth®, DSEE, long battery life and IPX4 water resistance. Truly wireless design with Bluetooth® wireless technology DSEE™ restores high frequency sounds lost in compression Up to 20 hours of battery life with charging case Listen all day, charge in minutes At full charge, these Sony true wireless headphones offer 10 hours of power, while the handy charging case provides an extra 10 hours. That means a full 20 hours of listening every time you leave the house! And if you need to top up in a hurry, a quick 10 minute charge gives you up to 60 minutes of play time. Splashes and sweat, no problem With an IPX4 water resistance rating, splashes and sweat won't stop these Sony earphones – so you can keep on moving to the music.