Part of the BLOX Series of compact and rugged solutions for audio connectivity, the RapcoHorizon CVPBLOX Volume BLOX is an in-line variable pad that provides continuously variable volume control. It features a potentiometer with knob on top, as well as an XLR female input and XLR male output.
This *continuously variable* PAD does exactly what it says. It attenuates a balanced signal, variably. Not sure why the other reviews are taking off starts for things that were never promised.
I bought this to use in my small trio when I use a headset mic. It works just as advertised but be aware of two things-the volume control is not stepped and it is real easy to inadvertently turn it up or down, especially if it's in a pocket. Second, since it is a passive device, there is often a very noticeable thump when you turn the mute on or off, especially if you're using a phantom powered mic. I also have a ProCo Power Mute that is completely silent when muting, but eats batteries like crazy. One other note for RAPCO, you should offer a belt clip for this device.