Robi Comb is a proven success with both nurses and parents. Robi Comb tells by an audible signal whether head lice are present. It is a reliable and safe alternative to chemical treatments and concerns about pesticide-resistant lice. Use for screening and re-screening. Detects, kills and removes head lice. Safe, effective and chemical free. Runs on a single "AA" battery (not included). Disinfect with 99% Isopropyl Alcohol between children. Using the LiceGuard Robi Comb: The Robi Comb emits a buzzing sound that will stop momentarily every time a louse is destroyed. The comb's teeth trap and kill lice electronically while being harmless to the user. Clean teeth with the small brush that is included and continue using. Caution: Robi Comb should not be used on or handled by persons who suffer from epilepsy, heart disease, or persons with a pace-maker or other neurostimulator. Robi Comb is for screening only.