Effective against all pests - This mosquito repellent can emit 22kHz-65kHz changing ultrasonic waves to kill all kinds of rodents and insects such as mice, cockroaches, spiders, flies , uncomfortable fleas and ants Keep them away from our homes and living spaces. Safe and Harmless - This mosquito repellent device repels pests by emitting ultrasonic waves, but humans and animals cannot hear it, so it will not harm their health. At the same time, there are no harmful chemicals or radiation, and it is risk-free to use. Wide Coverage - The ultrasonic insect repellent can cover 80-120 square meters. Easy to use: Just plug the repeller into a wall outlet (at least 30cm from the floor) and it will work. This repellent can be used in all areas of the home where food can be fed, such as kitchens, bedrooms, basements, garages and warehouses.