Bluetooth Headphones, SainSonic R9 Bluetooth V4.1 Wireless Sports Headphone - Fashion Black Advanced Bluetooth Technology - With the latest Bluetooth 4.1 and CVC Noise Cancellation 6.0 technology, the headphone provides high-fidelity stereo music and clear speech Universal Compatibility - The headphone can work seamlessly with your iPad, iPhone, iPod, Android Smartphones and any other Bluetooth-enabled devices Ergonomic and Delicate Design - Ultra light and sweatproof, it can be adjusted to fit your ears precisely and remains stable, perfect for outdoor activities High-capability and Rechargeable Battery - The 160mAh Lithium Battery is fast charging, and you can easily enjoy up to 6 hours premium quality talking/playing time and up to 180 hours stand-by time Multifunction Button (MFB) - With the multifunction button, this Bluetooth earphone allows you to realize remote control to your smartphone, such as play/pause, answer/end calls, volume up/down, previous track/next, etc.