I did my beard with one of those, very successfully. You need a very good light, and a good magnifying mirror. One of the benefits I found was that you could apply the current for a long time (15 secs to each follicle) and watch the pulp seep out rather than the quick zap that electrologists seem to do. You can also monitor the pain to an easily bearable level. Never could do the top lip tho so I used one that put the current through the skin with tweezers. Shouldn't have worked but it did a pretty good job. I only had a medium beard though.