* Clips On Books and Other Objects * Fully Adjustable 4.5″ Rubber Coated Gooseneck * 15 Lumens * 48 Hour Runtime * Powered by 2 CR1220 Button Cell Batteries (Included) * Easy Slide On/Off Switch Details The LitezAll Clip On Book Light is battery powered with a 48 hour runtime. 15 lumens of light is perfect for comfortably reading in dark environments. The 4.5″ rubber coated gooseneck is fully adjustable in all directions. Easy slide on/off switch on top of the light.