Molemax Mole Repellent Stake, Solar Powered, Uses Chatter Technology To Mimic The Alarm Sound Made By Moles & Other Burrowing Animals When Predators Are Present, Solar Cell Installs Flush With Soil Surface To Protect From Mowing Damage, Charges During Sunlight Hours & Can Work For Days On A Single Charge, Will Not Harm Animals, Sonic Repeller Works Year Round.