This is a nicely designed adapter that handle multiple plugs from either end (not all adapters do this). It is unfortunate that people do not undertsand the difference between an adapter and a transformer, and cannot read the labels on electrical appliances. If something is rated as 110/120V and you use the adapter to plug it into a 220/240V source, one should not be surprised to see smoke. Transformers are bulkier and more expensive, but not needed for most electronics whose power supply will handle 110/120/220/240V. If unsure, READ THE LABEL.