Powerful function. Support TTL flash, manual flash, strobe flash, 1/8000s high-speed sync, front-curtain sync, and rear-curtain sync.2.4GHz frequency, effective trigger distance of about 25m/82ft, and it can be used as both main light and slave light, supporting for three groups of A/B/C and 4 channels.With an AF assist lamp, which increases the likelihood of successful focusing in low light or low contrast conditions. When it is difficult to focus, the red focus light will automatically on to help autofocus. Flash coverage can be set to auto-zoom and manual zoom, which ranges from 24 to 105 mm. A built-in wide-angle diffuser enables flash shooting with ultra-wide-angle lenses up to 14 mm wide. Flash output power range from 1/1 to 1/128, the color temperature of 5600k ? 200K, widely applicable to portrait photography, wedding photography, event photography, travel photography, still life photography, etc. Compatible Canon Models:1D3/1D4/1DX/450D/ 5D2/5D3/5D4/5DS/ 6D/6D2/600D/7D/ 7D2/70D/700D/750D /80D/800D/1500D/200D Compatible Nikon Models : D4/D600/D610/D700/ D750/D7000/D7100/ D7500/D800/D810/D90