Warm NOTE: Christmas is coming and we will include a Christmas card that you can give to your friends or family as a Christmas giftBy the way: Merry Christmas Mice repellent for house: the ultrasonic pest repeller indoor uses ultrasound to stimulate and interfere with the brain and auditory nervous system of pests. In this way, pest reject ultrasonic plug in can drive away most types of pests for house. Energy efficient: the electronic pest reject ultrasonic plug in consumes less energy. And ultrasonic mouse repellent does not require any batteries, helping you save money in the long run. No need to deal with pests. No odor. Easy installation: the ultrasonic mouse repellent household power socket vertically. Installing the ultrasonic pest repeller indoor 30-70 inch from the floor is recommended. The blue led light illuminate, indicating the device is working. Wide coverage: the mice repellent for house is effective up to an area of 1600 sq ft. Don't worry your room is too big to cover. It's widely used in home, warehouse, office, indoor, etc. Keep mouse repellent indoor home. Material: ABS, Dimensions: 100x50x45 (mm), power supply voltage: 110~ 220V, power consumption: less than 2.5W, frequency range: 22~ 55KHZ Safe for child & pets: ultrasonic mouse repellent is inaudible to humans and household pets, environmental friendly alternative to dangerous poisons and sprayers, chemicals and traps, no bad smell and corpses.