Safe & Environmentally FriendlyOur ultrasonic insect repellent uses advanced ultrasonic and electromagnetic technology to drive away pests naturally without killing, this repellent is safe around the house, causing no harm to children or pets . Easy to Use Simply plug the Pest Controlr-spell into the outlet. No batteries will be needed, saving you a lot of replacement. And make sure there are no barriers like curtains or cabinets covering in front of the repellent. Wide Effective Coverage AreaThe ultrasonic insect repellent is suitable for an area of 80 to 100 square meters. It is widely used in homes, warehouses, offices, gardens, hotels, etc. Since ultrasonic cannot penetrate walls and solid objects, it is recommended to place one in a single room. Upgraded Ultrasonic TechnologyPest repeller uses a more powerful upgraded chip which makes parasites and rodents more difficult to immunize than before. It can drive away most types of flying and crawling pests such as mosquitoes, spiders, bed bugs, cockroaches, mice, fleas, ants, fruit flies, etc. Please Note Run the device for 2-3 hours before bedtime to avoid mosquito bites. Do not open the window when using the ultrasonic repeller, to prevent mosquitoes from entering. Product specification: - Ultrasonic frequency: 22~65KHz - Power: 3W - Effective coverage area: 80-100 m2. Product Features: 1 - Ultrasonic Pest Repeller solves pest problems without using chemicals, sprays or traps. < p>2 - Easy to use: just plug our ultrasonic repeller into an outlet. More trap setting. 3 - Wide application: this repeller can be plugged into homes, offices, restaurants, garages, warehouses and basements Note: 1.This machine should be installed 30~120 centimeters above the ground, and should be vertical to the ground and plug into the outlet. 2.The point of installation should be avoided to be behind the curtain, refrigerator and other furniture that deters or attaches the frequency. It is normal for mice and vermin to increase in the early days of use because they move away from the place of life after the attack of the ultrasounds. Usually it can take 3-4 weeks to notice results. Package including: 4 x Ultrasonic Repellents