Blue. Small size, great sound. These ultra-compact wireless earbuds feature high-quality sound, long battery-life and a go-anywhere design. Thanks to their simple operation, compact charging case and easy to use companion app, the WF-C510 is a great way to start enjoying the freedom and convenience of truly wireless earbuds. • Truly Wireless earbuds with compact charging case • IPX4* water/sweat-resistant, for go-anywhere everyday use • Multipoint- connect with 2 devices simultaneously • Ambient Sound Mode- remain aware of your surroundings • Up to 11 hours music per charge, 22 hours with the charging case • Stereo hands-free voice calls and reliable Bluetooth connectivity • Sony | Headphones Connect app; custom EQ, ASM settings and more • Quick-charge; 5 minutes charge gives approx. 60 minutes of music playback