Sony HVL-F42AM Operating Instructions Manual page 15

Power save
When the camera or flash unit is not used for three minutes, power switches off and
display panel indicators go out automatically to save the batteries.
• In wireless flash photography (page 36), control panel indicators disappear after
60 minutes.
• You can change the time until power save, or disable power save. (page 44)
• The power of the flash unit is turned off automatically when the POWER switch
of the camera is set to OFF.*
* When Sony digital single-lens reflex camera (other than DSLR-A100) is used.
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