SAFEST PEST CONTROL SOLUTION: Our Indoor Ultrasonic Pest Repeller, Mosquito Repellent, Moth guards ant killer mice repellent with Night Light emits high frequency ultrasonic waves that effectively repel rodents, while being completely inaudible to the human and pets, animal-friendly, and safe for children.LARGE COVERAGE AREA : The Ultrasonic Pest Repellent is effective for an area up to 800~1200 Square Feet. Please note that ultrasonic waves cannot travel through walls, we suggest using at least 1 device for each room, and at least a couple units for areas where pests problems are serious.HUMANE & NON-TOXIC PEST CONTROL: The Ultrasonic Pest Repeller with Night Light is a humane method of pest control, disturbing and driving the rodents away, but not killing them with harsh or toxic chemicals. Unlike glue traps, mousetraps, poisons or roach motels - all of which kill bugs and leave a messy cleanup, while our Pest Repeller minimizes human contact with mice, rats, or other disease-bearing rodents.