Bluetooth Headset, Bluetooth 4.1 Wireless Stereo Headphones, Retractable and Foldable Neckband Style Earbuds (Red) Distinctive foldable design : The bluetooth headset foldable design provides amazing flexibility, portability, and durability. Really convenient and portable to carry in your bag for daily use and for travel. Retractable headsets : this wonderful design provides a simple, Retractable Earbuds-Unique Approach to Cord Management design. This Bluetooth headphone allows you to leave your phone alone and leave your hands free but will not miss any call. Long battery life : stand-by time up to 300 hours, music time up to 16 hours and talking time up to 18 hours. With every about 3.5 hours charging, you can just enjoy your wireless sport/music time without any worry. Unique reminder : when a call comes , this Bluetooth headset will remind you with vibration , will never miss any phone call when you are doing exercise or even in a noisy environment.. Bluetooth 4.1 version--pairing is just easily and quickly connected with a simple switch button. Compatible with most of smart cellphones and other Bluetooth enabled devices.