LICETEC Robi Electronic Comb is an effective lice comb that helps detect and kill head lice without chemicals. The simple way to zap head lice! Safe and easy-to-use electronic lice comb. Licetec Robi Comb operates on a single AA battery. When switched on the comb emits a buzzing sound. When the buzzing stops during combing it means lice are trapped in the combs tooth section. The advanced design ensures efficiency, as the comb's teeth electronically kill lice while being harmless to the user.