This fill light has 8 highlight LED bulbs, provide supplemental lighting for creative photography and videography. Can be sync flash light. When you install the app of icanany, it can flash as the same time when using facetime camera. 3 kinds of brightness can be chose (strong, medium. Weak), customer can slide the switch in the side to choose different brightness model according to different environment condition. Can save the flaw that many existed phones which do not built-in flash for facetime camera.