Mpow Swift Bluetooth Sports Headphones, Light Sweatproof Wireless Running Gym Exercise Sports Headset (Black/Pink) UPDATED SWIFT Swift New Version upgraded a lot in Bluetooth tech and PCB board with the feedback of Swift users, more stable signal and worry-free for sweet during exercises. EXCELLENT MUSIC QUALITY In-ear ear buds design with apt-X ensure high quality stereo sounds and better outdoor volume. Mpow Swift features an excellent sound, especially the low sound density. ERGONOMIC DESIGN Comfortably fits either ear. Ergonomics Design and 3 pairs sport fit stabilizers will guarantee more stable and perfect fit for work-out. It will stay firmly and comfortably in place. EXCELLENT PLAYING TIME Extra long built-in battery provides up to 5 hours playing time for a 2-hour full charge, Bluetooth 4.0 technology provide you more time with Mpow Swift! SIMPLE TO USE Convenient in-line volume and microphone control allow you to adjust sound to your jogger, running and other Sport preference.