Open box Sony WI-C310 Wireless In-Ear Headphones Comfortable, versatile and practical, the WI-C310 wireless in-ear headphones will fit seamlessly and stylishly into your life. With a 15-hour battery life for longer listening, 0.35-inch driver units for clear sound and lightweight design for maximum comfort, these are the perfect first pair of wireless headphones. Clear, Punchy Sound Whether you're listening to pop hits, classical concertos or jazz solos, the 0.35-inch driver units deliver dynamic audio performance with deep bass, crisp treble and outstanding clarity. Bluetooth Connectivity Say goodbye to tangled wires and pulled-out plugs. With Bluetooth wireless technology, you can connect to your device wirelessly and enjoy flawless, interruption-free listening. Long-Lasting Battery Life With up to 15 hours of playback when fully charged, you can listen to your favorite playlists and podcasts all through the day. Quick Charge Functionality When your battery runs lows, just 10 minutes of charging gets you a full 60 minutes of playback. This means that even if you're in a rush, you'll soon be ready to get the music going again. If you have more time, you can charge the battery to full in just three hours.