Clear hands-free call quality. Conversation flows freely with clear hands-free calls thanks to a high-quality built-in microphone. You won't even have to take your phone out of your pocket. Stable wireless connectivity. Say goodbye to tangled wires - with Bluetooth wireless technology, you can connect to your device wirelessly and enjoy stable, uninterrupted listening. Long battery life of up to 25 hours. Enjoy up to 25 hours of non-stop music. And if your headphones are running low on power, a 10-minute quick charge will give you up to 60 minutes of playback. Easy operation with buttons. The WI-C100 headphones are easy to operate, with buttons to play and pause, skip tracks and adjust the volume, as well as receive calls. For convenience, the buttons have even been redesigned, with a more pronounced shape making them easier to press. Well-balanced tuning. Tuning is well-balanced from low to high frequencies, and vocals are natural and clear. So the WI-C100 headphones match any music genre. Packed with features. The WI-C100 wireless in-ear headphones offer great value, with a wealth of features including long battery life, high-quality sound, splash-proof design and compatibility with the Sony Headphones Connect app. Splashes and sweat, no problem. With an IPX4 water resistance rating, splashes and sweat won't stop these headphones - so you can keep on moving to the music. Fits easily into your life. Lightweight and portable, the WI-C100 headphones have a flexible neckband that makes them even easier to slip into your bag when you're on the move. Make your music sound more natural. When an original music source is compressed, it loses the high-frequency elements that add detail and richness to a track. Digital Sound Enhancement Engine (DSEE) faithfully restores them to produce high-quality sound that's closer to the original recording.