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Auto Check Light
Power Saving Function
The Green Auto Check Light (OK) located on the back of the flash is used to confirm that
In order to save battery life, your flash will automatically turn off if left idle for more than one
minute.
your subject is within the effective TTL range of the flash unit. If your subject is within the
effective TTL flash range after shooting, the green Auto Check Light will illuminate for
approximately 2 seconds.