Soul Electronics - Run Free Pro Wireless Active Earphones with Bluetooth (Electric Blue) Soul's Signature Bluetooth wireless sound - Bluetooth V4.0 system with apt-X stereo Audio decoder for the best possible Audio performance. Also includes wind noise reduction to improve call quality. Connectivity technology: wireless to stay on - the proprietary ergonomic interchangeable ear locks are seamlessly engineered onto the earphone body giving you the perfect seal with different sizes and the fit of your choice. Sweat proof - enjoy run free Pro anytime, anywhere and never miss a beat. If sweat causes your earphones to malfunction, We will replace it for free. 8 hours playtime - up to 8 hours of playtime for your wireless music and calls. Auto pairing mode - takes only 3 seconds to auto pair to your own phone. (Activates after initial pairing setup)