Sony WF-C500 Truly Wireless Black Ear Buds with Charging CaseTruly wireless headphones with Bluetooth, DSEE, long battery life and IPX4 water resistance. 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! 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