Considering what the Japanese come up with in the way of products that seem bizarre in the West, it's amazing they can be frightened by much at all. Does it have an off switch? If it was going to explode perhaps saving notes would be safer. There would have to be a test run. If it was going to explode, it may pay to find out how close it can be put to the china cabinet. What if it is in a safe? (I'm probably just looking for excuses not to save)
I wonder if they would be a hit at parties? (Could depend on the timing)
Might even get one.