Even though three-FEA hasn't been formally researched on exactly the same stage as regular amphetamines, it can be now assumed that like other substituted amphetamines with substitutions at similar positions, it most likely functions mainly like a triple reuptake inhibitor and/or releaser on the monoamine neurotransmitters serotonin, dopamine, and norepinephrine. https://juliuspnibu.dbblog.net/2638167/2-3-fea-pellets-40mg-120mg-an-overview