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Dr Clockwork Violet Comb one their most popular electrodes! Dazzle your friends with this color changing electrode! A rarer electrode can not be found, and Dr. Clockwork has made this electrode even more special. Our comb electrodes have a condenser coil in the spine creating an intense TENs toy, and an evenly distributed spark. Dr. Clockwork's Home for Electrical and Medical Oddities from Lebanon, New Jersey.