Aputure AHL-HC100 Amaran Halo LED Ring Flash has 100 LED with CRI less than 95. It runs on 4 AA Batteries. It has 8 adapter rings ranging from 49 to 72mm. Its max sync speed is 1/2000 second. It has 3 Flash modes - Full, Left and Right. It has 45 degree Vertical and Horizontal Coverage. Easy to use and well suited for Portrait and Macro Photography.