Measures 1 diameter x 5 high - Requires 2 AA batteries (not included);Hangs around your neck for hands-free cooling - Provides a powerful yet comfortable breeze - Great for outdoors;Hands-free cooling - Vertical Airflow - Color Coordinated Breakaway safety lanyard;Powerful one speed motor with internal 2.5 inch fan blade. Compact design makes it great for travel; easy to carry and store.;Perfect for outdoor activities or indoors at a theater, school or sporting event.