Indoor Ultrasonic Pest Repeller by Trapest - Natural Indoor Pest Control Repels Rodents and Insects - Plug In, No Maintenance INVISIBLE SHIELD: Our Trapest Ultrasonic Indoor Pest Repellent produces ultrasonic frequency sound waves which acts as an invisible shield that protects your home from rats, mice, spiders, ants, cockroaches and more. It's silent to you, buts pests are driven out from your home by the uncomfortable ultrasonic waves. EASY TO USE -- Simply plug the device into any standard power outlet and the pest control ultrasonic repeller gets to work immediately CHEMICAL-FREE PEST CONTROL: Indoor pest control solution -safe and maintenance free. Repels pests in a non-toxic, humane, and harmless way, unlike glue traps, mousetraps, poisons, or roach motels  all of which kill pests, leaving you a messy cleanup.. BEST PRICE: Our Trapest indoor repellent is one of the most cost efficient insect repellents on the market. We are provide a 30 Day cash back guarantee if you are not satisfied with the results. LARGE COVERAGE: Our Ultrasonic Pest Repeller is effective for a large coverage in an open area. Since the ultrasonic waves cannot penetrate walls, if you have a large infected area covering several rooms, we recommend placing one device in every room.