Speco Technologies DVR-T4IP - Manual (Page 19)

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6. VIDEO OUT
Terminals for composite video and s-video to connect with monitor
7. CAMERA
IN: Video input (to connect with camera output)
OUT: Video output (Loop-through output for video input)
8. FAN
Heat protection fan to reduce heat in the unit
9. POWER INPUT
Power cord terminal (free voltage, 100 - 240VAC, 50Hz/60Hz)