Stealkart Wireless Bluetooth 4.1 Earphone with MIC for Hi-Fi Music and Calls, in-Ear Headset Designed for Sports, Gym, Travel and Driving, for iPhone, Android Smartphones, iPod,iPad and laptops Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music./Bluetooth version:V4.0 + EDR. Can talk, listening to music/Small and light, stealth design./Battery type:50mA rechargeable lithium battery/2 in a row, to the telegraph, voice prompt operation