Rodent Repellent System–Rat Repeller is basically a rodent repellent system, which is designed to remove away unwanted rats from protected places. … Attack Wave Rat Repellent is a device with auto-changed and auto-sweeping high intensity frequency. Its consists of Rodent Panel, Ultrasonic Transducer, Sensor Cables, etc.., transducers work silently, humans can’t hear them so there is no discomfort to Humans.