LED Book Light - Black - With 6 Ft. USB Adapter Included Use with included 6 ft. USB adapter (Batteries not needed for use with USB) or with easily replaceable AAA batteries (not included) Flexible neck will bend in any direction to illuminate exactly where you need light Extra long 6 foot USB cable...compare to other lights with 3 foot cables. With 2 LEDs you can choose how much light you want or needuse with 1 or 2 lights with switch Base can also act as a free-standing unit 2 Bright white LED bulbs are cool, never burn out and are energy efficient