Our bird repellent uses a dual, non-invasive method to safely and harmlessly address bird infestations and reduce food damage. The 6000 mAh battery provides extended battery life. With an ultra-long range of 30 meters, one bird repellent can control an acre of land. A single bird repellent has a coverage area of approximately 20-30 meters (approximately 40-60 meters in diameter) and is most effective in open, well-ventilated areas.