【Safe and Environmentally Friendly】: Ultrasonic Mosquito Repellents uses a physical method to repel mosquitoes rather than chasing chemicals, non-toxic, chemical-free, eco-friendly, 100% harmless to humans and pets. Reduce power and save a lot of money. 【Ultrasonic Technology】: Ultrasonic Mosquito Repellents use ultrasonic waves to irritate the nervous system of mosquitoes and insects, influence the brain of mosquitoes, affect each pest’s neurological hearing and immunity and keep them away. Leave them away from you. 【Widely Used】: Anti Mosquito uses ultrasonic technology to effectively repel mosquitoes and is widely used against mosquitoes, cockroaches, ants, flies and other insects. It can be used in many occasions such as mountaineering, fishing, camping, barbecue, golf, etc. 【Portable and practical】: Small in size and lightweight, with a keychain, the mosquito control devices are portable to carry. The ultrasonic mosquito repellent is effective for an area up to 20 sqm. 【Quiet and