From that hairfacts.com site:
The E-Pen sold by Elysse Electro is a home-use version of the doubtful "transdermal hair removal" method. It sends energy through an electrified Q-Tip type of cotton swab.
E-Pen should be avoided by all consumers.
This device has not shown any published clinical evidence it can work as claimed.
It is currently being promoted heavily on television through direct-response commercials