You do not have to often replace battery as this LED light has integrated 1000mAh rechargeable battery.
SUPER BRIGHT: Consists of 4 SMD LED Bulbs, 3 brightness modes and 1 switch button behind, 1st click high level, 2nd click warm light, 3rd click white light, 4th click off. Bright enough for reading at night and can easily light up 2 pages of book, notebook & anything else you'd like lit up
WIRELESS & PORTABLE: It can be powered by built-in battery so it's wireless and portable. You can take it move around in your house or take it with you when travelling. It can be recharged via USB to laptop/computer or outlet via recharges via adapter.
EXTRAORDINARY BATTERY LIFE?Built-in 1000mAh lithium rechargeable battery can last up to 10 hours after 2 hours fully charge. Together with a protective circuit to prevent overcharging, discharging and short circuits
STURDY CLIP & FLEXIBLE GOOSENECK: The book light designed with an extra sturdy padded clip, you can clip it to books for easy reading. LED reading Lamp with adjustable gooseneck can lets you position it exactly where you want to optimize your lighting source
MULTIPLE USES?This reading lamp is perfect for book (night-time reading), shelves, cupboards, computers, laptops, desktops, pianos, music stands and much more.