Bluetooth Headphones Wireless Earphones for Sport Running with Mic New Black By Frayagresa (Black) Powerful Rechargeable Battery:Built-in polymer lithium battery (100mAh), up to 150 hours of stand-by,up to 10 hours of talk time, 2 hours charging time. Hi-Fi Stereo Sound: Built-in HD Microphone with CVC6.0 noise cancellation, ensure Hi-Fi Stereo Music Sound and Strong Signal. Let you get high quality and clear voice even in noisy environment like inside a gym and running/cycling on the road. Connect two devices at the same time: You can answer calls with two devices or listen to music one one and talk on the other. Support voice function: Just say "Yes" or "No" to pick or reject call.