【Ultrasonic and Electromagnetic Wave Technology】 This ultrasonic pest repellent use safe & advanced effective technology to disturb and irritate the nervous system of pests, which is more powerful which make pests and rodents are harder to immunize than before. Work well on mice, cockroach, ants, spiders, bed bugs, mosquitoes, insects, rodents, flies, fleas and other kinds of pests. 【Safe and Friendly for Human & Pet】 The spider repellent built with high quality ABS safety, flame retardant material.The pest repeller is with eco-friendly design, such as low energy consumption, flame retardant and so on.Mosquito repellent without killing them, has no chemicals, non-toxic, no radiation, odorless and noiseless.It’s safer and more friendly. 【Wide Effective Coverage】 The yard guard ultrasonic animal repeller can effectively deter pests in an area up to 1200 sq. ft, which can widely be used in houses, warehouses, shops, restaurants, hotels, offices, yards. Ultrasonic waves cannot travel through walls, so each room installed one pest repeller is recommended. 【Easy to Use& Zero Maintainance】 Plug the ultrasonic repeller in a power outlet and the red light will on. This insect repellent can effectively eliminate and drive away pests immediately without any mess. No cleaning up of dead rodents or insects. Recommend install ultrasonic pest reject to the socket about 20~30cm away from the floor.No battery required. Help you save a lot of costs. 【Satisfied Guarantee】 We devote ourselves to provide you with professional technical support and guarantee 100% refund for quality problems within 60 days.If you are unsatisfied with the repeller in any reason, please contact us, we’ll make a replacement or refund for you immediately.