Kills lice electronically without chemicals! When switched on the comb emits a buzzing sound. When the buzzing stops during combing this indicates a louse has been trapped in the teeth section of the comb, and therefore acts as an excellent way of checking hair for lice. The dead lice can then be removed. The unit comprises metal-coated teeth, and when a louse is detected between two teeth a small electrical charge passes between the teeth and kills the insect.