Sound Intone X13 In-ear Sweatproof Sports Wireless Headphones Lightweight Bluetooth V4.1 Earphones with NFC Microphone &Dual for Smartphones, Android Phone All Bluetooth Devices. (black) 1.Sound Intone X13 is designed for sports usage , made by waterproof material, ergonomic innovative and waterproof sweatproof design ensures this headset is comfortable and secure for sports ,running ,jogging ,walking ,exercising,etc. 2. Stylish looks and built-in Bluetooth chip with HiFi Stereo earphones ensures you could enjoy high quality stereo bass sound. Mini Portable Wireless headsets with built-in microchpone and CVC6.0 Noise Cancellation produces clear loud sound, convenient and easy to answer and end the phones. 4. Bluetooth Version 4.1 supports hands-free with earhook,NFC&Dual ,it could connect two cellphones simultaneously,easy to pair.12 meter Bluetooth cover range. Compatible with most Smartphones, iPhone, iPad, iPod,Android Phone All Bluetooth devices. 5. Built-in batteries provide up to earphones with up to 10 hours talk time, 16 hours playing time ,160 hours standby time and battery volume up to 160 MAh; provide with 3 months warranty