The xTag is a small, USB-powered wireless microphone system. It is actually bi-directional for use with Skype, etc.
It is quite adequate for use with Panopto, but we have found significant variations in frequency response from unit to unit. Additionally, most sound quite 'boomy' -- surprising for a microphone designed specifically for voice use. We have attempted to contact Revolabs in this regard, but we have never received a return call or e-mail.
Since it is bi-directional, it tends to commandeer the PC's playback path whenever connected via USB, which must be reset in Windows to the preferred output device, usually the motherboard's audio connections.