As a deer draws closer to your "mouth-watering" tulips and shrubbery, the motion sensor on this DeerChaser® activates, causing it to sound a loud, high-frequency noise, and flash a bright 2-LED light: continues for 2-15 minutes (adjustable) past the last motion detected. Senses movement in a 120? area, up to 25' away. Works day and night. Safe around pets. Three "D" batteries (not included) last up to three months, depending on activation length and setting. Weatherproof housing includes mounting bracket, and measures 4"x10-14".
Read mechanical deer repellent reviews at http://www.Deer-Departed.com