Easy to Use - Just plug the electronic pest control ultrasonic repellent in power socKets; It will start to repel the pests when the blue light on More Safe for Child & Pets - Ultrasonic sound is inaudible to humans and household pets,environmental friendly alternative to dangerous poisons and Sprayers, chemicals and traps, no bad smell and Corpses Simple In Use & With Blue Night Light - To install our Ultrasonic Pest Repellent you just need to plug it into an electric Outlet. When the blue LED Night Light comes on, that means that the Device is worKing & this ultrasonic Rodent & Insect Repellent has started to drive Pests out from your Walls, Floors, Cellars & Attics Large Coverage & Silent Operation- This Ultrasonic Pest Control operates silently so you can calmly set it up in a child’s Room, a Bedroom or a Guest Room. Pest Repeller can effectively cover & control Area of up to 800~1200 Ft2 per Device. Installing 1 Device per Room is recommended. Note that Ultrasonic Waves can’t go