It activates on noise, so a clap or a shout from a visitor sets it moving rather than it running on a loop all evening. Two LED eyes and built-in sound effects do the rest. Eighteen inches across, which fits a door, a window, or a wall without needing a yard. Zero assembly, a hanging rope included, and it runs on three AA batteries. Key Features Specifications Note: Actual product color may vary slightly from the images due to lighting and display settings.