Outdoor Pest Deterrent Device can detect an unwanted pest at about 35 ft. while protecting an overall area of about 950 sf. An internal sensor detects a warm body within range and triggers a powerful, 10 second ultrasonic sound burst which repeats until the pest leaves the protected area – which it soon learns to avoid all together. Output frequency sweeps from 20– 45 KHz, completely harmless but annoying to cats, dogs, mice, rats, rabbits and other criiters. Mount at ground level with the included stake, or can be wall mounted. For garden, greenhouse, shed, planting beds and other landscaped areas of your yard. Uses a 9v alkaline battery (not included).