Brand new in retail package 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. Guaranteed 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 8 Hours Playtime Auto Pairing Mode - Takes only 3 seconds to auto pair to your own phone.