The nights are long! This fierce fight against your intruders, mice, rats, dormice, martens, ends thanks to your ultrasonic device. Mouse and rat repellent. EffectiveSimply plug the ultrasonic anti-rodent box into a socket, without adjustment. Eliminates rodents within 3 weeks. Inaudible to the human ear or pets. Directions for use: 1 device per room. Larger Protected Area and Low Power ConsumptionLarge coverage area - Each ultrasonic electronic repellent is effective for a large area up to 80-120m. Please note that ultrasonic waves cannot pass through walls. Veuillez noter que les ondes ultrasonores ne peuvent pas traverser les murs. Although our pest repeller works well, if you have a large infestation, we recommend placing our pest repellent in every room. Safe and Environmentally FriendlyThe product is non-toxic and environmentally friendly, our repellent is safe and effective, the ultrasonic frequency emitted by this machine is inaudible to humans and pets. Safe for children, family and pets. However, if you have a pet hamster at home, do not use this ultrasonic repellent.