1. It is harmless to the human body to repel mosquitoes by the principle of audio frequency. 2. You can carry it with you when you go out to repel mosquitoes. 3. Please place your baby at the head of the bed or a short distance higher place before going to bed. 4. The anti-mosquito effect can reach 1-3 meters, please try to avoid obstacles to make full use of the mosquito repellent effect. 5. Three-stage timing setting (2H.4H.8H) is time-saving and convenient.