This Solar Powered Rodent Repeller uses ultrasonic pulses to scare away moles, mice and snakes lurking around your property. This Solar Powered Expeller can effectively repel insects by vibrations and sonic pulses, without harming humans and the environment, 8 hours of solar charging lasts 5 days, effectively and continuously preventing rodents from returning. It requires no tools, cables or batteries to remember to change. Spaced 50˛ apart, this 4-pack covers up to 6500 square feet. Push the stakes into the ground about 2 from the bottom of the solar unit. OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.