The Ultrasonic Repellent Pack of 6 is equipped with smart technology that emits different frequencies of ultrasonic waves to irritate the nervous system of insects and rats. This makes them feel uncomfortable and gradually flee. The intermittent changes in ultrasonic frequency prevent them from developing immunity and adaptability. Each ultrasonic repeller in this pack can cover up to 120 square meters, making it ideal for use in various rooms. For best results, it is recommended to install the repeller vertically at a distance of 20 to 80 cm from the ground. Say goodbye to mouse traps, mosquito traps, and pest control poison, as this repellent is safe and eco-friendly. It is non-toxic, chemical-free, radiation-free, and consumes less power. It is also 100% safe for humans and pets. The Ultrasonic Repellent operates silently with low frequency ultrasonic waves, ensuring that it does not disturb you or your pets. Please note that it may take 2-6 weeks for the repellent to show its full effectiveness, depending on the environment. This pack of repellents is easy to use, simply plug it into an outlet and let it work. No batteries are required, saving you money on replacements. The key features of this mosquito repellent include its safety for use by pregnant women and babies, its noiseless operation, and its effectiveness against a variety of pests. It can cover an area of up to 800-1200 square feet. The repellent follows a permanent process to repel pests, starting with a lag period in the first 1-2 weeks, followed by an effective period in the third week, and finally a stable period in the fourth week. To prevent the pests from returning, it is recommended to continue using the repellent. Please note that the electronic mouse and mosquito repellent should not be placed around dampening materials like carpets and curtains. It is safe for pets such as dogs, cats, birds, fish, and rabbits, but not recommended for rodent-type pets like hamsters, gerbils, guinea pigs, tarantulas, and chinchillas. Key Features: Smart technology emits ultrasonic waves to irritate pests Large coverage of up to 120 square meters Safe and eco-friendly with no chemicals or radiation Super quiet operation Easy to use, simply plug into an outlet Effective against mosquitoes, mice, rats, flies, and pest insects Permanent process to repel pests Safe for use by pregnant women and babies