USB or Battery Powered-Great for use as a desk light plugged into your PC or as a battery powered reading light * Flexible Neck-Direct lighting onto your keyboard or book without disturbing others * Handy Clamp-Clips to headboards, desks and tables to provide as table light source wherever needed * Use Eco-Friendly 28 LEDs of energy saving, saving 90% than incandescent lamp,high efficiency and long life * Adopting the LED which is energy-saving, high brightness and long life