Ultrasonic Pest Repeller with Adjustable Head and Night Light for Indoor -Pack of 4 Electronic Plug In Indoor Pest Control Device, Mice Repellent, Insects Repellent, Flying Bugs or Insects NAUDIBLE ULTRASONIC WAVES: Indoor Ultrasonic Pest Repeller with Adjustable Night Light emits high frequency ultrasonic waves that effectively repel rodents, while being completely inaudible to the human ear and non-rodent pets TWIST FOR ACCURACY:Electronic Plug In Pest Repeller- Unit twists 180 degrees to accurately direct the waves at the location of the infestation LED NIGHT LIGHT: Ultrasonic pest control 4 pack unit has a LED indicator light to tell you the unit is working properly, which doubles as a night light NON-TOXIC AND SAFE: our Electronic Plug In Pest Repeller is no use of toxic or harsh chemicals, safe for use around children and non-rodent pests PLUG-IN, NO MAINTENANCE: ultrasonic pest control unit plugs into a power outlet. No batteries or maintenance required