Instruct: Classify the given review as either positive or negative.
Query: WARNING

Be very careful that you do not plug a different transformer into your phone adaptor. This is the only product I have ever owned that blew out, and became useless, from a different plug being placed in it. All others either worked anyway,or could be reset. If this was going to be a problem, this manufacturer should have made sure that only it's plug fit the adaptor. Or at least allowed the unit to be easily reset.