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【Powerful Camera Flash】 Equipped with high-quality flash tubes, the FK310 camera flash offers high conductivity. With GN33 high guide number which can provide strong and stable light. Its sophisticated flash head is designed to give off light evenly. And a constant color temperature of 5600K±200K in daylight. 【Foure Kinds of Flash Mode】This flash speedlite supports Manual mode,Multi mode, S1 and S2 Modes. Press the MODE or M button to M Mode. The flash will follow the camera shutter flash. S1 and S2 are light-induced flash modes: S1 will follow the main flash, and the S2 mode will synchronize the second flash of the main flash. Note: Dont support TTL and the camera menu setting function. 【MuIti Flash Mode】Under Multi flash mode, the flash will fire at your setting of output power/ flash frequency and flash times. And through the left/right Fn button, you can adjust the output power. The range of output power is 1/128-1/64/-1/32/-1/16-1/8-1/4. If need to set flash times and frequency, please press the flash times/frequency select button. the multi-flash time/frequency instruction icon will flicker in the LCD, at this time you can adjust the flash times/flash frequency through the left/right Fn button. 【Power Control】The flash unit has 22 levels of power output control which is shown by LCD screen. And adjusts the brightness through the left/right Fn button. For a test flash, Press the test button to fire a test flash with the current settings or to wake the flash from sleep mode. Press and hold [Mode] and [Test] to reset the flash. 【Wide Compatibility】This photography flash is compatible with Canon Nikon Panasonic Olympus Pentax Fujifilm and Sony with Mi Hot Shoe cameras, like a9 a7 a7II a7III a7R III a7RII a7SII a6000 a6300 a6500 (NOT compatible with Canon EOS Rebel SL3/250D, Rebel T7/1500D 2000D, Rebel T100/3000D 4000D, Canon EOS 200D Mark II, Sony a850） 【What You Get】Photoolex FK310 LCD Flash Speedlite*1, Protective Pouch *1, Stand *1, Instruction manual *1, Color Filter*12pcs, 7*24 Hours customer service and 24-month warranty.