The solar snake ultrasonic wave driver is divided into 5 frequency files, ie, 30 seconds, 35 seconds, 40 seconds, 45 seconds, and 50 seconds. each time it has 4 seconds of sound. more effective than others. The repellent snake LED lamp closes automatically when the solar panel is charged or with light. when the solar panel is not charged or in the dark, the LED lamp will work in two modes - often bright and flashing (30 minutes each time). 2. Free of harmful pesticides or chemicals, this mole repeller does not trap or harm animals, it simply scares away. human, clean, and safe, while effectively ridding your garden of pests. 3. Solar panels powered, 1.2 V 800 MAH Ni-cd Rechargeable batteries (supplied), can effectively charge the product to maintain a long period of time all day standby head. no need to connect an electric wire, or replace batteries.