General description Ultrasonic Pest Repeller (4 Pack) is designed to create a hostile environment that effectively repels and prevents pests such as mice, cockroaches, ants, and mosquitoes from returning. Utilizing ultrasonic technology, it operates within a frequency range of 20 kHz to 65 kHz, ensuring long-term effectiveness against rodents and other pests. Technical specifications Ultrasonic frequency range: 20 kHz to 65 kHz Effective coverage area: 40 m² Usage Ideal for homes, garages, warehouses, and other spaces. Recommended placement: 1 device per room or 1 device per 20 m² for optimal results. Other information Eco-friendly and non-toxic; no harmful chemicals or pesticides used. Low maintenance; immediate operation with no need for bait changes or trap cleaning.