Super Strength Ultrasonic (Solar Powered) Mole Rodent Repeller Deterrents for your Garden. The mole, rat and mouse repellers emit a sonic vibration every 30 seconds, Effective range of 65 Sq Mtrs, providing pest control in your garden 24 hours a day, 7 days a week, Humane and safe pest control method. Insert repellers into ground, (Recommend 1 device every 25 metres).