Portable bright LED lamp includes 24 long-lasting LED bulbs. Touch power switch features 3 varying levels of brightness, 30%, 50% and 100%. LED desk lamp's space-saving design is ideal for use in the home, office or for traveling. LED reading lamp measures 5"H x 3"W (10.5"H when extended). Powered with USB cable or 4 AA batteries (not included).Miles Kimball