Built-In 2.4 GHz Wireless X System Compatible with Most TTL Systems 400Ws, 1/256 to 1/1 Power Output Flashes Flash Duration: 1/240 to 1/12, 820 sec 1/8000 sec High-Speed Sync 0.01-0.9 sec Recycling Time 30W LED Modeling Lamp, 4800K, TLCI: 93 Stable Color Temperature Mode