Many times the internal transformer has multiple taps, which allow you to use it with a 120 or 220 volts mains. This should be a simple job for any decent technician and save you the hassle of yet another gadget in the system.
On the other hand, if you are buying an adapter the make sure that it is NOT an auto-transformer. It would then behave as an isolation tranformer and there are benefits to having such a gadget...
On the other hand, if you are buying an adapter the make sure that it is NOT an auto-transformer. It would then behave as an isolation tranformer and there are benefits to having such a gadget...