TechLite GV001A00 Lumen Master Book Light, Black Book light gives 8-lumens of light using five 5mm LED bulbs powered by 2CR2032 batteries Comes with a head switch that has three modes: low, high and strobe The housing is made up of silicon rubber Dimensions: 0.94-inch by 1.17-inch by 6.9-inch; weighs 0.05-pounds