Panasonic Toughbook CF-29LCQGCBM Reference Manual page 11

LED Indicators
Power status of the
*1 multimedia pocket
SD Memory Card status
*1
MP is the abbreviation for Multimedia Pocket.
This indicator lights when power is supplied to a device in the multimedia
pocket.
It is not lit when a second battery pack is installed in the multimedia
pocket.
You can confirm the status of the second battery pack with
(multimedia pocket device status).
This indicator lights when the SD Memory Card is accessed.
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