Jabees LAT-Bsport-GRN BSport Bluetooth CSR V4.1 Sweatproof Sports Stereo Headphones with NFC&ATPX Green Latest CSR Bluetooth V4.0 Class II: More secure and stable connection. Less power consumption. Comfort Fit for Workout: Soft and Removable design, strap is adjustable. Your ultimate comfortable choice for wireless music and call when training. Item is very compact(20g),you will not feel uncomfortable to wear it up. Sweat proof: Waterproof testing, Immersion in water beyond 1 meter, take out Immediately; water splashing from any direction--No Harmful effect. So go ahead, move, sweat and rock hard, Running In the Rain. Enjoy High quality music: Bluetooth 4.0 and aptX technology, Delivers CD-quality wirelessly over Bluetooth from iPhone 6 iPhone 6s,samsung or other. Good sound insulation, stereo bass,6 hours for music. I love also can love it. High connection strength: Quickly and easily pairing and connection through the in-built NFC.it can connected when you turn it on. Not easy to lose connection.