New Red Sports Stereo Wireless Bluetooth Stereo Earbuds Headset Headphone with In-line Microphone and Control, Built in Li-battery, Noise Cancellation Technology, Listen Music or Telephone Clrear Bluetooth technology Stereo Earbuds, Enjoy your Music Tangle Free In-Line Microphone and Controls for Music,Volume skip tracks and adjust volume Built-in microphone, answer phone calls easy, Digital noise reduction for call clarity Ultralight, comfortable, easy-to-wear. 33 feet working distance, Sport headphone, Up to 8-9 Hours of Listening and Talk Time Note: when you first get this headphone, please charge 4 hours firstly, and if still have issue, please let us know, we ensure to help each customer to solve all issues.