Pest repellers are devices designed to deter unwanted insects and rodents from homes and gardens. They often use ultrasonic sound waves, vibrations, or natural scents to create an uncomfortable environment for pests, encouraging them to leave the area. These devices are popular because they offer a chemical-free alternative to traditional pest control methods. Many pest repellers are easy to use and require minimal maintenance. Some are plug-in units that work continuously, while others are battery-operated and portable. Common types include ultrasonic pest repellers, natural repellents, and electronic traps, each targeting specific pests like mosquitoes, ants, or mice.