Panasonic DMC-GH4KBODY - Manual (Page 333)

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12. Connecting to other equipment
• Use a battery with sufficient battery power or the AC adaptor (optional). If the remaining battery
power becomes low while the camera and the PC are communicating, the status indicator
blinks and the alarm beeps.
Disconnect the USB connection cable safely. Otherwise, data may be destroyed.
• Before connecting or disconnecting the AC adaptor (optional), turn the camera off.
• Before inserting or removing a card, turn the camera off and disconnect the USB connection
cable. Otherwise, data may be destroyed.