This device uses powerful ultrasonic pulses that pests like mice, mosquitoes, flies, and moths dislike, making them uncomfortable and driving them out of your home. A wide range of frequencies from 10-100kHz repels various pests. Three operating modes: ① Mild pest infestation ② Moderate pest infestation ③ Severe pest infestation With night light (can be switched ON/OFF) *This product is new and unopened. Operation has not been confirmed. Ultrasonic pest repeller, set of 2, for mosquitoes, flies, mice, and other insects.