This would be easy to setup. It is a device that turns on an electrical socket whenever an alarm sound triggers it (kind of like the “Clapper” thing they used to advertise on TV).
https://www.harriscomm.com/sonic-alert-traditional-system-uss-360-universal-sound-transmitter.html
So your CGM alarm would trigger the device to turn on the electrical socket. And you have something plugged into the socket, like either a light, or a vacuum cleaner, or a blender filled with marbles.
So ultimately your CGM alarm is turning on the blender filled with marbles.
Referenced in a couple places on FUD, but never had a thread specifically to this device:
wifi-alarm-for-night-monitoring
a-frightening-experience-at-sleepaway-camp