Dahua NVR52-4KS2 Series User Manual page 8

Do not drop or splash liquid onto the Device, and make sure that there is no object filled with
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liquid on the Device to prevent liquid from flowing into it.
Put the Device in a well-ventilated place, and do not block its ventilation.
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Operate the Device within the rated range of power input and output.
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Do not disassemble the Device without professional instruction.
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Transport, use and store the Device under allowed humidity and temperature conditions.
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Maintenance Requirements
Replacing unwanted batteries with the wrong type of new batteries might result in explosion.
Preventive measures (including but not limited to):
Replace unwanted batteries with new batteries of the same type and model to avoid the risk of
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fire and explosion.
Dispose of the old batteries as instructed.
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The appliance coupler is a disconnection device. Keep it at a convenient angle when using it. Before
repairing or performing maintenance on the device, first disconnect the appliance coupler.
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User's Manual