Sokos Foldable and Retractable Neckband Wireless Bluetooth Headset with Microphone - Black Foldable & Retractable Headphones - Unique Approach to Cord Management design, convenient to carry in Your Bag for Daily Use and Travel.Rubber process oil is Painting on it's surface, bringing soft handle for you. Outstanding Long Battery Life and Voice Prompt - Bluetooth Headset have 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! One Key Switch Function - It is more easy to operate the Bluetooth Headphones with just on key function no need to press and hold the button for 3 seconds. Also with previous and next button to control songs. Compatibility - Bluetooth 4.1 and Smart voice promotion keep the phone call's quality like using original cell phone. When there is incoming calls Bluetooth headset will vibrate to remind you. The headphone can work with 2 mobile phones at same time. Unique Function - This Bluetooth headset will remind you with vibration when a call comes, will never miss any phone call when you are doing exercise or even in a noisy environment.