Working PrincipleThe product detects animals intruding 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 120 and a maximum distance of 8 9 meters. This configuration of two combinations can therefore protect a small garden in general. Frequency and sensitivity Adjustable6 frequency levels from 0 to 10. 5 (0 being off) for different animals. The sensitivity adjusts the size of the detection range up to 8-9 meters.Outdoor readytwo charging options (USB and solar), waterproof rating sufficient to withstand the rain. Thanks to; its mounting options (hanging on the wall or plugging into the ground), this repellent can continue to operate at outdoors for long periods of time.Instructions for useOur instructions have different frequencies recommended for different animals. If the recommended settings do not work, you will need to try a different frequency band for your specific use to get the best results. Also note: do not block the infrared sensor.