Working principleThe product detects animals that intrude into the area through infrared detection and uses ultrasonic waves and flashing LED lights to repel them. (Note: Humans can perceive some of the ultrasound, so please keep this product away from areas where babies and children are often active). Pack of 2This repellent has a detection angle of 120° and a maximum distance 8 to 9 meters. This configuration of two combinations can therefore protect a small garden in general. Adjustable frequency and sensitivity6 frequency levels from 0 to 5 (0 being off) for different animals. Sensitivity adjusts the size of the detection range up to 8-9 meters. Outdoor ready two charging options (USB and solar), waterproof rating enough to withstand rain. With its mounting options (wall hanging or ground plugging), this repeller can continue to work outdoors for long periods of time. Directions for Use Our instructions include different frequencies recommended for different animals. If the