I have a Wzye Surge Protector. It is on my desk next to my computer. I have been hearing a sound in the room for a while. One of my kids thought it was a computer fan as they could hear it also. It is fairly constant. Though it does stop at times. I finally was able to follow the sound and identified the Wzye Surge Protector as the source. I started unplugging things from it. When I unplugged an iPad from one of the USB ports, the sound finally stopped. I plugged the device back in and the noise started again.
Aside from the sound being a constant annoyance, I am worried about the potential for a destructive failure.
I was able to make a recording of the sound with my phone. I have attached the recording. The recording is not very loud, so you may have to turn up the volume in order to hear it.