Mighty Bright XtraFlex2 Book Light with Adaptor - Purple Two SUPER LED's as bright as six regular LED's and never need replacing! LumaLenz Optical grade lens spreads light evenly with no hot spots. MightyGrip Strong wide mouth clip grips almost anything, or use free standing as a task light. MightyFlex Fully adjustable arm will position and hold light in place. Includes AC adaptor or use with three AAA batteries (not included)