EasyPro ULTR6 Ultrasonic Pest Repeller/Deterrent Great way to protect against unwanted pests Can be used around ponds, in the garden or anywhere you want to keep animals away Motion detector senses animal and emits a loud, piercing ultrasonic sound at a frequency that people cannot hear Operates on 6-C cell batteries which provide up to 2000 activations Includes mounting stake for ground use or can be hung on wall, posts, etc