Regular body lights are about the size of an aspirin tablet, but this extra large body light is nearly the size of a dime! The super-strong magnetic back allows you to stick a bunch of lights nearly anywhere, from your ears to your hair to a visor! Flashes bright red and green, with a nice sparkle effect. Uses 2 replaceable AG3 (LR41) batteries (included). Comes with 2 extra sets of batteries (WOW!)!