Sports Bluetooth V4.1 Stereo Headphones with Microphone Factory inventory of a certain brand, not actually used, but because it has been in stock for a long time, we have replaced the battery and tested it to ensure the quality is good, so it is sold as used. Sincerely Product Features * Bluetooth 4.1 stereo headphones ideal for sports * Incredible sound performance - soft in-ear silicone earbuds with great audio resolution * Lightweight, comfortable, safe and easy to wear * Voice enhancement function and battery charge display on IOS system devices * Up to 8 hours of battery life for music or conversations * Gaming and chatting and VoIP (Skype, MSN, etc.)