ZoomableWith a focusable head with spherical LED and high quality optical lens, it allows you to easily control the area you need to illuminate. Adjustable Brightness and Color3 color temperatures and 10 levels of brightness adjustment, meet most of your lighting needs, suitable for use as bedside reading light, book light, kids reading light, work light and more. STURDY CLIP AND FLEXIBLE ARMThe led reading light has a very sturdy clip with non-slip spacers and 5cm opening, which can be easily fixed on desks, craft tables, work areas, bedside and bedroom bookshelves. Compared to other 8mm gooseneck lamps, we use a 9mm diameter gooseneck lamp that allows you to easily make 360-degree adjustments without bouncing back, providing a stable and most comfortable angle for your reading. USB POWER SUPPLYThe book light is powered by USB DC 5V, which is suitable for most of the devices that support USB port, such as power banks, PCs and laptops, computers, power banks, USB charger adapters (not included). Warranty18 months worry-free warranty, if you have any quality problems, please feel free to contact us, we will replace it for you for free.