Palm-sized light, full-strength Natural Spectrum! Tuck this 2.2 oz light into purse, pocket or briefcase and treat your eyes to Verilux flicker-free, glare-free indoor sunlight anywhere. See better! Read or work without eyestrain in low-light settings -- and without disturbing others. It clips to books and menus or stands on its own. Makes it easier to see laptop keyboards, too. Lamp head swivels. Runs on 2 regular AA batteries (not included) or use cable (included) to plug into your computer"s USB port and you won"t need batteries. Ingenious design includes built-in charger for rechargeable batteries. Cold-cathode bulb (included) never needs replacing.