CowboyStudio FM-600 600W LED Studio Monoblock Flash with LCD Screen Guide#: GN80; Recycle Time: 0.1-1.5s Output Power Range: 7-stop aperture, 1/10 energy variable Modelling Lamp: LED Type; Color Temperature: 5600K; Safety Fuse: 6.3A Flash Triggering Method: Photocell, Test Button Triggering Voltage: 5V; Photocell Sync Distance: up to 20m