All that really means is that it's good at hearing you even when you aren't next to it, and even when there's other chatter going on. (cnet.com)
Video Online Chat Room - This room is basically for webcam chatters who love to do online instant webcam chat with other chatters. (tdberyoza.ru)
I will be using them mostly in office to block out different humming sounds and as much conversations, TV and other chatter as possible although I know noise cancelling headphones are not ideal for the latter but surely they will help somewhat. (thewirecutter.com)