describe: NO MESS, NO RISK PURCHASE: Our repellent will instantly chase away harmful pests without any mess or odor. No dead pests to clean up, no bad smells and carcasses, no batteries required, huge savings. Results can usually be seen within 2-3 weeks, depending on the severity of the pest infestation. If you have any questions or concerns, please feel free to contact us. We stand behind our products and want to ensure you have a pest-free environment. 360 PROTECTION OF YOUR HOME WITH NO DEAD SPACE: Our insect repellent effectively covers an area of up to 1600 square feet, providing full 360 protection for your home or office. However, since ultrasound cannot penetrate walls and solid objects, we recommend using one unit per room for maximum effect. Our insect repellents are widely used in homes, warehouses, offices, restaurants, supermarkets, hospitals, granaries, etc. QUIET PEST CONTROL: Our ultrasonic pest repeller emits high-frequency sound waves that are inaudible to humans. These waves are designed to disperse, harass and deter common household pests such as cockroaches, spiders, mosquitoes, ants and rodents. Our intelligent multi-frequency ultrasonic conversion system gives pests nowhere to hide. KIDS AND PET FRIENDLY: Our rodent repellent is a better repellent choice for kids and pets. Unlike traditional repellents, our ultrasonic waves cannot be heard by humans and household pets. Our repellent has no smell or chemicals, making it child-friendly, pregnant women, and pets-friendly and harmless. EASY TO USE, ONE UNIT PER ROOM: Our insect repellent is easy to use. Simply plug them into an electrical outlet and when the blue night light comes on, they will begin to repel pests. Place the ultrasonic repellent where its waves will not be affected by walls and furniture. We recommend mounting the repeller 30-40 inches above the ground for flying pests and 8-12 inches above the ground for crawling pests. Package contents: 4 pieces of mosquito repellent