EASY TO SECURE: The WITHit French Bull LED Book Light Clip On is designed to fasten to books and eBook units easily and securely so you can comfortably read in bed on the couch or anywhere else you like to curl up with a good book. FLEXIBLE NECK DESIGN: The light emitted from this reading book light fully illuminates the book pages and screen thanks to the flexible neck design. It can be adjusted so you can get the light exactly where needed. REDUCED GLARE: The expert design and shape of this lightweight reading light includes 1 bright LED that illuminates pages and eBook devices, including Kindles, with less glare. You can read in complete darkness and experience less strain on your eyes. BATTERY POWERED: The WITHit French Bull LED Book Light for reading comes with (2) CR2032 lithium coin cell batteries. Replacement batteries can be purchased on Amazon in bulk for approximately $0.25 - $0.50 per unit. PORTABLE & LIGHTWEIGHT: The WITHit French Bull portable reading light is easy to fold and can be conveniently stored in travel cases, backpacks, purses, and carry-on bags. It weighs 2.4 ounces and measures 8.5 x 1.5 x 4 inches.