Compact, 4" x 2-3/4" x 1-1/4", (10 cm x 7 cm x 3.5 cm). 23 L.E.D. lights. Swiveling side-arms/base with magnet at end. 2 light functions; 3 large L.E.D. bulbs on end, or 20 smaller L.E.D. bulbs on face. Swivel hanging hook, (folds into the back to disappear). Takes 3 "AAA" batteries, (INCLUDED!). CAUTION: Do not place magnetic materials near computers, discs, DVD's, credit cards, or other items that are senstive to magnets. Do not place directly on computerized sewing machines.