Yay, it works! And the buzzer is reasonably loud but not too loud (highly subjective of course) and it stays buzzing until you unplug it. We did six new eggs bought yesterday and six that are about 3 weeks old.
After cooling in ice water the eggs peeled easily with no discernible difference.
Another first world problem solved.
I just ordered this one, which came today. Have not unpacked or tried it yet.
According to video's, it tells you to rinse them in cold water right after cooking. I hope it doesn't have to be ice water.
http://www.amazon.com/gp/product/B00005KIRS/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1