I understand that Rav Moshe Feinstein permitted using an electric razor to shave the beard under certain circumstances in how the shaver is made. I was wondering what is a permitted shaver and what brands do you know that have been permitted for use?

I am sorry I cannot answer this question. You must ask a local authority who knows the different brands of shavers that exist in your locality. The principle is that the blade of the shaver must not touch the skin and the shaver must work on a scissor system. esw