Kitzur Shulchan Aruch:
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Unless the KSA holds that todays electric shavers are a “taar”, he permits shaving with them. Rav Heineman is of the opinion that most shavers are not a “taar”, the link to his teshuva on the Star-K website has been posted several times. R’ Heineman also quotes R’ Moshe but unfortunately, doesnt cite the source (a Yad Moshe will find it quickly).