Before I purchased a B5 and two M1 devices I purchased a couple of OSKA Pulse devices. While wearing an OSKA Pulse on a cord around my neck the other evening I knelt next to a desk at home. I noticed a very low volume buzzing in my ear when my ear was next to a hanging, energized USB-C plug. I played with the OSKA and the USB-C plug for a few minutes and found that the buzzing occured when the plug was near my ear and the OSKA coil was next to it.
Can anyone explain this?