Is Smart Device : no Battery Type : Lithium Metal Power Source : DC Is Batteries Required : No Is Batteries Included : Yes Light Source : LED bulbs Certification : none Origin : Mainland China Certification : none Item Type : Book Lights 30/60 Mins Auto Timer & Memory Function This small book light with 30/60 min auto-off timer, on the blue light mode, it is set to be on for 30 mins, on the green light, it set to be on for 60 mins. It will be auto-off even if you accidentally fell asleep, great for kids and avid reader. The book lights has a memory function and it can remember your last setting. 3 Colors & 5 Brightness Dimmable This book light has 3 modes: amber mode(1600K), soft mode(4200K) & natural mode(6000K). Each mode has 5 brightness levels and you can choose the most suitable level for your eyes.The amber mode is a warm book light for reading in bed at night. Amber mode filters 99.9% blue light to protect your eyes and reduce your eye strain. It is bright enough to illuminate both pages, while it is dim enough not to disturb your sleeping partner. Flexible Design & Illuminate the Full Pages The clamp of the clip on light can open maximally 210°; The light head can be turned left, right and downside with angles of 90°, 90°, and 45° respectively. It is flexible enough for all book sizes. You can adjust the angles freely to get comfortable lighting and for a better light coverage on books. USB Rechargeable & Long Lasting for 80+Hrs Standard USB rechargeable and directly lug it into your laptop, power bank, adapter, car charger, or USB outlet for recharging, no additional cables needed. The booklight was built-in 500 mAh battery provides 8 hours reading time in the highest setting, and up to 80 Hrs reading time in the lowest setting. There are 4 battery power indicator and you can tell how much power left at any time. Lightweight & Portable The small book light is only 1.4oz. It’s lightweight so you barely notice you have it clipped to your book. It also can free standing on a surface and and easily lights up workspace. it is small when folded and can be placed in a shirt or pants pocket, perfect for reading on an airplane and traveling.