... .hands free,USB jack 2.ISO 9001,CCC,CE 3.MIC type:collar or clip 4.property:commonality 5.no distortion,no ... interference collar & clip microphoneFeature/Function:1.MIC Types :headphone, collar or clip,ear-hanging MIC.2.Compact Size: Small size ... use and manage.3.Digit designed,instead of any other MIC.4.LED display charging status,balanced battery,volume.5.USB ...