.?Newest Chips Technology?: Which is much better than normal ultrasonic pest repeller. The Electronic pest device uses emits high-frequency ultrasound to drive away the pests. ?More Safe for Child and Pets?:Our device is 100% safe and effective. Ultrasonic sound is inaudible to humans and household pets; Environmental friendly alternative to harmful and dangerous chemicals, poisons and traps, no bad smell. ?Wide Effective Coverage?: The mosquito repellent is effective in an indoor area up to 1600 sq. ft. It’s widely used in homes, warehouses, offices, gardens, hotels, etc. We recommend you to install one for each room . ?Easy To Use?: Just plug the device into the socket. Please make sure to install it vertically 7-31 in away from the floor. And make sure there are no barriers like curtains or cabinets covering in front of the repellent. Most customers can see the results within 2-3 weeks! ?Great Service?:If you have any problem, please feel free to contact with us .We hope you sleep comfortably and have a pest free environment.