Free Shipping! Godox Built-In 2.4 GHz Wireless X System, Compatible with Most TTL Systems, 400Ws, 1/256 to 1/1 Power Output, Lithium-Ion Battery Powered, Up to 390 Full-Power Flashes, Flash Duration: 1/240 to 1/12,820 Sec, 1/8000 Sec High-Speed Sync,...