The device emits ultrasound pulses that are inaudible to humans and pets, but disrupt ticks and fleas, keeping them away from your pet. The range is approximately 2.5 meters. The device is primarily intended for preventive purposes. The black product is made of 50% recycled plastic. It is environmentally friendly, free from chemicals and fragrances, and completely safe to use, even for young, elderly, sick, or pregnant pets.