This device is interesting for the following reasons: It does not need a battery. Even my 5 year old daughter uses it without inhibitions. It alleviates the itching in some stitches temporarily. It is somehow better to use it than nothing. But it also does not bring much. It costs almost nothing.
By contrast, the ByteAway is with the heat plates considerably more reliable: The help in 90% of cases for 24 hours or even permanently. In parts of southern Germany, however, not sufficient.