1MAIN FUNCTION: This electric repeller is mainly used to repel mosquito, making living environment more comfortable. 2ULTRASOUND PRINCIPLE: According to the principle of ultrasound, the repeller imitates the sound made by dragonflies wing to drive away all kinds of mosquito. 4APPLICABLE SCENARIOS: The insect repeller can be widely used in outdoor travel, camping, fishing, outdoor work, baby supplies, pet repellent. 5PORTABLE DESIGN: The electronic pest repeller is small and compact, designed with a keyring, easy to carry. 3SAFE USE: The pest repeller has no electromagnetic wave radiation, noise pollution, which is safe and eco friendly, can be safely used by infants and pregnant women. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.