Vantron VT-M2M-BTA-DE-A, User Manual

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Use tested power source This product still contains a button
lithium battery as a real-time clock after its external power source is
removed and therefore should not be short-circuited during transportation
or placed under high temperature.
Place cables properly: Do not place cables at any place with
extrusion danger.
1.9 Cleaning Instructions

Please power off before cleaning the device.

Do not use spray detergent.

Clean with a damp cloth.

Do not try cleaning exposed electronic components unless with a dust
collector.

Support for special fault: Power off and contact technical support
personnel of Vantron in case of the following faults:

The device is damaged.

The temperature is excessively high.

Fault is still not solved after the operation according to the
manual.