Mellowleaf Wireless Stereo Bluetooth V4.1 Headphones Noise Cancelling w/ Microphone For Sports Sweatproof Earbuds Headset for iPhone 6, iPod Touch, Apple & Android Smart Phones & Bluetooth Devices Bluetooth CSR V4.1 technology: the signal strength is nearly twice times than the general bluetooth headset, High-fidelity stereo music and clear speech within 10 meters of device, begin enjoying CD quality stereo music instantly. Noise Cancellation: Most advanced bluetooth CVC6.1 noise cancellation, accurate knows the difference between voice communication and noise. Simple-to-use: Take calls hands-free. Easy access buttons on headphones for play/pause/answer/end/reject call/volume up/volume down. Exercise Ready: Sweat-proof earpiece design, portable, and lightweight wireless headset stays in your ears comfortably, our wireless headphones will let you enjoy music during a variety of activities. Powerful Rechargeable Battery: Enjoy 6 hours of Talk/Playing time. Intelligent 2-Link Design, able to connect two bluetooth devices at the same time and free switch.