Tickless Pet devices last for at least 6 months. Attaching Tickless Pet to collars or harnesses is very simple with the provided metal ring! Once attached, your pet is free to explore nature leaving tick worries behind. Let their curiosity run wild; Tickless Pet will handle the tick defense. TICKLESS® technology underwent rigorous testing and was proven effective by a clinical study at the School of Veterinary Medical Microbiology and Infectious Diseases Laboratory at the University of Camerino, Italy. Chemical and fragrance-free 94% efficiency against ticks Safe to use even for puppies, ill-, pregnant and elderly pets also The operating range is 5 feet Scientifically proven All-season long protection Preventive solution