A strong ultrasonic signal frightens animals. Thus, animals can not get used to the sound, and the effect of repellent is stronger, frequency from 13.5 to 23.5KHz. The strong flashing will scare the animals away, especially at night time. Switch from 0 to 3 for different working modes 0: OF 1: working 5 seconds, interval 50 second 2: working 5 seconds, interval 2 minute 3: working 5 seconds, interval 5 minute Batteries' life varies with the setting of the ultrasound. Choose different working modes due to different needs of customers. PRODUCT FEATURES Powered by 3xAA batteries (not included Connect the USB cable or adaptor with the DC socket. (USB cable and adaptor not included). When the power is on for 15 seconds later, the device will execute the mode that people chose. Sweeping frequency from 13.5-23.5Kh APPLICATION: Garden, Yard, Pond, Balcony..... OEM, ODM SUPPORT