The head of each reading lamp has an independent switch,and 3 color temperatures (1600K to 5500K),and 0-100% stepless dimming brightness settings.USB Rechargeable & 10 HOURS For Reading.no flicker,blue light filter design,with 8 advanced LEDs lamp beads,maximum brightness 90 lumens.Includes the included 1100mAh rechargeable battery.smart design,no need for charging cable,just Just unplug any of the reading lamp heads ,USB direct charging.Ergonomic neck around design and it is totally hands-free.Lightweight, Compact, Portable & Durable.the bendable book light doesn't require much space and can fit easily into your carry-on suitcase.This LED book light perfectly suitable for indoor or outdoor, book light for reading in bed at night, writing, mending, night jogging. Act as a flashlight or a reading lamp. Detachable led light head2 individual control centeItem Type: Book LightsPower Source: Rechargeable BatteryIs Smart Device: NoBattery Type: Lithium MetalLight Source: LED BulbsIs Batteries Required: NoWattage: 5WFeatures: 3 Colors Brightness Stepless Dimming Neck Reading LightFeature: Bendable Arms,Gifts for Book Lovers.