It used a transistor, a resistor, and a capacitor in the same configuration that Kearns had designed.

When you finish a tube of mascara, toss the tube but keep the wand. Wash the wand thoroughly with soap and warm water, then use it to comb through your lashes after applying mascara.

When the voltage in the capacitor reached a certain level, it triggered the transistor; the transistor turned on, and the wipers wiped once.