A vapor dispensing device having a high transverse loading stability includes a relatively low profile with respect to the supporting wall or electrical receptacle such that the frequency and impact of accidental physical contact with the device are appropriately reduced. A CAD computer program product and an apparatus comprise corresponding features. The first transistor has a higher current flow capacity than a second transistor associated with the second data path. Identifiers for the erroneous data blocks are transmitted to the source application after all of the data blocks have been initially transmitted.