Compatible with Most TTL Systems. 400Ws, 1/512 to 1/1 Power Output. Up to 460 Full-Power Flashes. Freeze Mode: 1/3470 to 1/27,770 sec1/8000 sec. | Godox | | AD400Pro II All-in-One Outdoor Flash 400Ws Up to 460 Full-Power Flashes | Best Buy