Dostyle Bluetooth Headset Wireless Neckband with Retractable Earbuds Bluetooth Headphones (Black) Creative Foldable Body Design - The foldable function makes our bluetooth headphones more convenient to carry, you can put it in your bag and pocket, no need to worry it will be break off. Retractable Earbuds Neckband Headphones - Bluetooth headset integrated retractable wire management function, just press retractable cable button to adjust your needed length. Sweatproof, lightweight and neckband design, providing you with a comfortable hands free experience, perfect for outdoor sports running. Hi-Fi Stereo Music Sound - Latest bluetooth 4.1 version, with built-in HD microphone, advanced noise cancelling technology to ensure high-quality music and clear phone calls. Long Battery Life and Voice Prompt- about 3.5 Hours Charging, standby time up to 300 hours, music time up to 16 hours and talking time up to 18 hours. No need to worry about the battery life, just enjoy your trip and exercise! Vibration and Voice Prompt - It will remind you with vibration for incoming call, you will not miss any call with this function. The headphone can work with 2 mobile phones at the same time, compatible with most of bluetooth enabled devices.