Albrecht DR400 Guide D'utilisateur page 41

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Never touch the power plug with wet hands and never pull on the
power cable when pulling the plug out of the power socket.
•
Make sure the electrical voltage specified on the DR400 and its power
plug is corresponding to the voltage of the power socket. Incorrect
voltage will destroy the device.
•
If the DR400 is not used for a long period of time, disconnect it from
the power supply by unplugging the power plug.
•
In case you use headphone with the line-out, always reduce the
volume before put on the headphones. After the headphones are
positioned properly, increase the volume to the desired level.
•
Always power off the DR400 when cleaning it.
•
Never use any harsh or strong solvents to clean the DR400 since
these may damage the surface of the device. Dry, soft cloth is
appropriate. However, if the DR400 is extremely dirty, it may be wiped
off with a slightly moist cloth. Make sure the device is dried off after
cleaning.
•
When you have to ship the DR400, store it in its original package.
Save the package for this purpose.