marsboy Sport Earbuds Blutooth 4.0, Wireless Sport Earbuds for Running, Waterproof Bluetooth Earbuds Stereo Sound Bluetooth Earbuds: CSR8635 Bluetooth 4.0 Chip - Ensures excellent sound quality for music enjoyment and hand-free phone calls. Sport earbuds bluetooth: Guarantees stable and comfortable wearing when exercising, running, climbing, driving, skating,camping, fishing, etc. Wireless sport earbuds: Light-weighted Back-Hang Style - Avoid the disturbance of twining wires and enjoy sport activities freely. Universally Compatible - Suitable most Bluetooth-enabled devices. Such as iPhone7 plus 7 6s plus 5S 5 4S and Android smartphones,Samsung Galaxy Phones and so on. Swift and Convenient Button Control - Adjust the sound volume, switch songs and answer phone calls easily during exercising. Product comes with 12-month warranty. 24/7 customer service available.