Nissin i40 Instruction Manual page 6

Basic Operation
i40 has an energy saving power off function
To save battery energy, i40 automatically switches to stand-by mode, in A mode, TTL
mode & Manual Power mode, in about 2 minutes of idle use; in SD mode, SF mode
& Wireless Remote Mode (RMT), in about 5 minutes of idle use.
While i40 is in the stand-by mode a Pilot button blinks every 2 seconds showing the
flash unit is in stand-by mode. To turn on i40 again, press the camera's shutter
button halfway or press any button of the flash unit.
In case i40 is not in use for over 60 minutes, the unit is completely turned off.
To turn on i40 again, take the first step of turning the flash unit on.
Protect overheating function
i40 is automatically turned off when repeating hi power full flash continuously over 20
to 30 times to protect the flash circuitry from overheating. It will automatically recover
after 15 minutes of inactivity. The pilot button will blink in the red color every 1.5
seconds.
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