Power switch: open the flash when ON, close the flash when OFF. The mode switch button: flash mode in circulation between M/S1 / S2 / LED switch. Sound toggle: press once when open or close the voice prompt. Power button [on] [of] and [sure] button in the middle, through the button to fine-tune the flash output power can be, determined according to middle [sure] button. [-] LED [+] button, press the button can adjust the lighting lamp brightness. "PILOT" button, press this button can test the flash output brightness. Opening and closing power electrical switches can be opened or closed flash power. Recommended in the flash power then take out the battery.After open the flash power, the flash will read the last save Settings before shutdown. If still not full of charging more than 20 seconds, the flash will automatically shut down, the need to replace new battery. You can press "PILOT" button to test the flash is normal. After using, electrical switches can be shut off the power. M mode, you can set the flash light, according to your demands. Through [left] [right], [up] [down] and [sure] in the middle of the button can be adjusted by the brightness of the flash. Flash brightness adjustment range is 1/128 ~ 1/1, 8 gears of brightness, each leg can have 8 fine-tuning, UP and DOWN button used as trimming output power. When shooting, you only need to set the flash brightness, adjust the camera and press the shutter, flash flash under the camera sync signal. S1 / S2 mode by pressing the mode [switch button] can make flash into S1, S2 mode. Both these models suitable for use as deputy light away from the machine, they are suitable for manual flash and TTL flash environment. In these two kinds of mode to adjust the output brightness and M mode, only need operation [left] [right], [up] [down] [sure] in the middle of the button and the button is ok. When using S1, S2 mode, can be achieved by rotating flash lamp holder, make the sensor to the master lamp. Flash test no matter in what kind of mode, you can by pressing the "PILOT" button to test whether the flash flash is normal. Test flash, flash can according to the selected output power level of the corresponding intensity of flash.