One note on these Varizapper, is that if the customer installs the battery back to front, the machine will not turn on. Battery must only be one way, see picture here: notice the battery with the FAT button on the top is on the right. Reverse this and the Varizapper will not work.
Second problem is related to shipping. We have been advised that some Varizapper Modules have slipped down a little during shipping causing the lower module to disconnect. This causes the machine not to turn on. The module below is completely disconnected to the upper unit (next picture) and illustrates how these modules can separate and must be firmly clipped together.