Using natural solar energy to rid your yard of pests 24/7. This motion-activated repeller will flash its LED lights and emit ultrasonic sound waves to drive unwanted birds, mice, squirrels, dogs, cats and more out of your yard or garden. No harmful chemicals, complicated wiring or costly electric bills are required for this ultrasonic animal repeller ... and its high-frequency 13.5K – 61KHz sounds are inaudible to humans, offering safe, convenient protection. Simply mount on a fence or tree, or stake it in the ground with solar panel exposed to sunlight. Offers 22-ft. range of protection for yard, garden, patio, garbage cans and more. Solar panel requires 4 AA batteries (not included). Plastic, metal. 3 1/2"L x 15"W x 5"H solar pest repeller.