Ultrasonic Snake Repeller Working Principle: Mole Repeller will vibrate every 30 seconds and send out low-frequency sound pulses of 400-1000 Hz in all directions. Anti mole scares away invading animals by stimulating their central nervous system. Safe and Effective: No need for drugs or other killing tools, snake repellent can easily drive away animals such as dogs, foxes, minks, raccoons, mice, skunks, wild boars, bats, birds, etc. Mole repellent harmless to the human body, environment and animals, very suitable for gardens, farms, greenhouses. Moles repellent has a wide range of action: This mole repellent is centered on the installation site, with an action radius of about 15 meters and an impact range of 700 square meters. For better effect, it is recommended to install 1-2 mole repellents every 36 m. Energy saving and waterproof: Solar mole repellent powered by solar energy, no additional battery is needed, which can save you a lot of energy. Mole trap has IP65 waterproof level,