Dahua A Series, Руководство пользователя

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Foreword II
device is installed and maintained by professional engineers.

The surface of the image sensor should not be exposed to laser beam radiation in an
environment where a laser beam device is used.

Do not provide two or more power supply sources for the device; otherwise it might
damage the device.
 When the camera is in the condition of PoC power supply, do not connect any other device
between the camera and PoC transceiver including UTC, Balun, optical transceiver,
distributor and convertor and so on; otherwise, the device might get burned.

PoC supply voltage is up to 52V. Do not dismantle the device during normal operation;
otherwise it might cause danger to both device and users due to high voltage.