Advantage of Ultrasonic Animal repeller This ultrasonic animal repellent scares away unwanted animals through the Infrared sensor. Power supply: solar power +3x AA size rechargeable batteries or 9 V, 200mA adapter. If adapter plugged, the item will keep working, the PIR sensor will not work. If there are a few days as cloudy or rainy, you can charge the item via the adapter. Red LED: indicates the unit is activated. NOTE: 1. It happens that human can hear part of its range. So put the device as far as possible from human life place. Do not install the device in children and baby playing ground area. 2. Do not cover up the PIR sensor.Features: Adjustable Sensitivity and Frequency: You can adjust the item sensitivity and frequency according to different environments to increase the range of protection. Wide Range: Infrared PIR motion sensor angle up to 110 degrees and detection range up to 8m away activating the cat repellent to emit a high frequency sound, irritating to the cat and almost inaudible to humans. Easy Set Up: Just place the rep