The Falcon Eyes Satel II is a professional 600Ws studio flash, powered by the supplied removable battery. The Satel II offers the ability to use it everywhere, without being dependent on a power outlet. The high-speed trigger lets you flash at a shutter speed up to 1/8000s second. The 2.4GHz connection between the RF-S2 transmitter and Satel II guarantees a reliable solution. There are two kits available, for both Canon and Nikon cameras. At this moment you are viewing the Nikon version. At full power it can flash up to 400 times, on one battery charge. After 6 hours, the battery is fully charged.