Victor M793 Ultra Sonic Pest Chaser Rodent Repellent - Repel Mice and other rodents High-frequency ultrasound repels rodents PestChaser emits ultrasound at varying volumes (peaking at 100db) and frequencies (ranging from 32 to 62 kHz) Easy to use: plugs into 110V-AC wall outlet 6 ft cord enables ideal placement Reduction in rodent activity should occur within 6-10 days