Built-In 2.4 GHz Wireless X System Compatible with Most TTL Systems 600Ws, 1/256 to 1/1 Power Output Lithium-Ion Battery Powered Up to 360 Full-Power Flashes Flash Duration: 1/220 to 1/10,100 Sec 1/8000 Sec High-Speed Sync 0.01-0.9 Sec Recycling Time 38W Modeling Lamp Stable Color Temperature Mode