Rentokil Beacon Mouse & Rat Repeller (Pack of 3) RKLFM87 Beacon Sonic Mouse and Rat Repellers repel and prevent mice and rats with ultrasonic frequencies. 24-hour protection. One unit protects areas up to 46 square metres ? 495 square feet. Safe near children, cats and dogs ? ideal alternative to bait and traps. Simply plug into any socket ? low cost peace of mind.Pack of 3. RKLFM87