LED book light Size:260*25*20MM Battery:2*CR2016 CTN:49.5*47*32CM Package:clam-shell G.W./N.W.:9/8kgs Advantages of LED lighting: Bulbs never need replacing Versatility-home/office/out doors High durability Almost unbreakable_no glass or filament Energy save-batteries last longer Using 2X CR2016 battery