This headset works seamlessly across PC, mobile phones, tablets, Bluetooth-enabled desk phones and smart watches. Smart sensors answer calls by simply putting on the headset, mute by taking the headset off and pause music for incoming calls. Enhanced voice alerts announce caller ID, mute and connection status, talk time level. Dynamic Mute Alert senses and alerts you when you try to talk when muted. Smart mic boom: wear on either side and maintain locations of R/L stereo and volume/track buttons.