1.Humane voice reporting tips, Built-in microphone
2.Stereo, can listen music
3.Wireless frequency:2.4-2.48GHz
4.Transmission distance: the farthest 15 meters (Due to the surrounding environment is different, cell phone signals and other uncertainties, there will be some impact transmission distance)
5.Speaking time: the longest 10-15 hours
6.Charging time:2 hours For all mobile phone use