I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 33)

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1.
The “Sensor In” port for Dry contact input only, otherwise it will cause the device
damage.
2.
The “Relay Out” port for NO (Normal Open) type device only.
3.
The current must be less than 10A, when controlling electric device to relay output.