Pentax ETH-310 - Manual (Page 21)

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2.4 Other Functions
2.4.1 Remaining battery indicator
The status of the remaining battery capacity is displayed with
”
” symbolizing the battery capacity.
Battery full - operating possible
Operation possible
Operation still possible
Get the battery ready for a stand by
Replace batteries
Automatic Power-off function
If there is no key operation for about 30 minutes, the power supply is
turned off automatically.
This function can be set to NIL by special key operation. (Refer to 3.5
Setting of automatic power off function.)