Features: Cononmk AK4.0 HSS outdoor strobe light, which is small and light,east to take, rich color detail performance, fully meet the photographer's creative inspiration. Built in dual systems and one-click change system. The No.1 system FP mode can 9 brust every second.The No.2 system support HSS(1/8000s). Full output 1/1 to 1/64. It owns 7 stops aperture and adjustable by 1/3, which means total 19 stops. Compatible with Nikon ,Canon cameras .