Leica M Instruction Manual page 107

FOR THE CHARGER
If the charger is used in the vicinity of radio receivers, it can
interfere with the reception; make sure there is a distance of at
least 1m between the devices.
When the charger is in use, it can make a noise (buzzing) – this is
quite normal and is not a malfunction.
When it is not in use, disconnect the charger from the mains as
otherwise it uses a certain (very small) amount of power even when
no battery is inserted in it.
Always keep the charger contacts clean, and never short circuit
them.
The car charging cable supplied
– may only be operated with 12V electrical systems,
– may never be connected while the charger is connected to the
mains.
FOR MEMORY CARDS
Whilst a picture is being stored or the memory card is being read, it
may not be removed, nor may the Leica M be turned off or exposed
to vibrations.
For safety, memory cards should only ever be stored in the
antistatic cover supplied.
Do not store memory cards where they will be exposed to high
temperatures, direct sunlight, magnetic fields or static discharge.
Do not drop or bend a memory card as this can damage it and
result in loss of the stored data.
Always remove the memory card if you will not be using the Leica M
for a long period of time.
Do not touch the connections on the rear of the memory card and
keep them free of dirt, dust and moisture.
It is recommended that the memory card be reformatted from time
to time, as fragmentation occurs when deleting, which can block
some of the memory capacity.
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