Vitorun - Repelente de perro de mano por infrarrojos, disuasorio ultrasónico para perros, tapón de corteza + entrenamiento para perros de buen comportamientoKeep unfriendly dogs away; protect yourself from dangerous dogs while walking, jogging, or bicycling; Safe, humane and effective dog repeller; Can works with most dogs, it emits piercing ultrasonic tone that dogs hate and make dogs away from people; Stop dog approaching you before it can bite you; A good protector for yourself; Also can be used to train dogs and bring you more fun; Need a 9V carbon battery (not included).