Questions about Yealink Voltage transformer

I think so, because I use my Canadian 110v tools.

Yes

Unfortunately, we could not find the information you were looking for. It is best to contact the third party dealer directly. They will be able to advise you best about their products.

Unfortunately, we don't have any information about the frequency range in the output and my clarification about this was unsuccessful. A user manual is included in the delivery. Unfortunately, the manual is not available to us as a PDF file.