This CVB-B/O condenser boundary microphone lives up to Shure's reputation for quality. +48V phantom power required. I used a dual-type USB phantom power preamp which allowed me to connect it to a conference computer where we used whiteboard collaboration for remote conference participants. Room. Our users were impressed. Another great feature is the Commshield® technology. This blocks RF interference from the plethora of smartphones and other wireless technologies throughout the room. Blocking out what you don't want to hear is almost as important to sound quality as what you do want to hear.