1) Latest Bluetooth version 4.1 - Combine with 6G CVC Noise Reduction technology?? Compatible with iPhones?? Samsung cell phones?? Android cell phones and any other Bluetooth enabled devices.</br>2) Comfortable Neckband style design - Foldable body and Retractable Earbud?? comfort your wearing.Build-in microphone and hands-free. Take it anywhere you go.</br>3) Outstanding Battery life - 300 hours standby time?? 18 hours talking time and 16 hours music time. With every about 3.5 hours charging?? you can just enjoy your wireless sport/music time without any worry.</br>4) Vibration for incoming call - The right side of th"et will vibrate when someone calls you. Will never miss any phone calls.</br>5) Easy to use - just turn the headset on enter pairing mode?? no need additional operation. Easy to change music and the volume and songs.</br></br>Product Description</br></br><b>Features:</b><br /><br /> 1.Retractable neckband design.Especially suitable for sporting situation. <br /> 2.Portable and space-saving <br /> 3.Amazing clear sound.The overall voice quality for calling sounds natural and works great. <br /> 4.Cutting-edge Design Concept??be ergonomically.Comfortable Wearing Experience. <br /> 5.Unparalleled Battery Life.Built in high capacity rechargable lipo battery. <br /> 6.Pair headset with 2 mobile phones. <br /> 7.Answer&End call/Incoming call vibration remind. <br /> 8.Power Promt.Each time turning on this headset??it will report headset battery power remaining. <br /> 9.Voice Dial.Unlock the mobil