RAPOO H100 Wired Stereo Headsets - HD Voice Rotary Microphone Volume Adjustment 3.5mm ***December Promotion: Buy 10 get 1 Free Offer Available Valid Until 23/12/21. Contact your account manager for more details *** Specifications ■High quality stereo audio output ■Rotary microphone, bring a clear voice calls ■More convenient volume adjustment ■Standard 3.5mm audio interface, to adapt to a variety of audio output devices 3.5mm ■Comfortable and Portable Link: http://rapoo.com/product/367