Too Geshmak,
It would be different than a standard shaver as it uses two blades (despite the name) with scissor action. As far as closeness, i was under the impression that would be a problem with a one bladed machine as it’s “דומה לתער “. But if you have a scissor that gives a close cut then it wouldn’t fall under that category despite its closeness.
I showed the one blade trimmer to rabbi felder. He seemed to think to was ok.