Wireless Bluetooth Over-Ear Headphone, GBTIGER Wireless Bluetooth 4.0 Stereo Over Earphone Headset with Built-in 500mAh Lithium-ion battery & Microphone Sport Earphone Blue With V4.1 Version BLuetooth, High sensitivity microphone design, clear voice Adapt low noise and cancellation technology, enjoy Hi-Fi stereo quality sound, Support Micro SD / TF card slot and FM radio, keep pace to world anytime Portable back-hang convenient for sport. Rubber shell, comfortable wear on ears ,Voice incoming call phone number Easy operation, with the buttons of pre / next, mode switch, on / off, volume + / -, etc.Operation range: 10m Built-in rechargeable 500mAh lithium battery.You can be on the move all day with these headphones with the long battery life of 10 hours per charge.