A Continuous Process To Repel Pest Week 1-2: quick impact & run away from shelter Week 2-4: non-immune & nervous system damaged Week 4-6: intolerable & flee from home forever Tips: To keep the pest from coming back continued use is recommednded Material: ABS Plastic Package Contents: 4 Packs Output Power: 2 to 3W Frequency Range: 50 KHZ~65KHZ Effective Range: 1200 to 1600 Square Feet