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User Manual of DS-91/90HFI-ST/RT/XT & DS-81/80HFI-ST & 91/90/81HWI-ST Series DVR
21
ALARM OUT
Connector for alarm output.
16
GROUND
Ground (needs to be connected when DVR starts up).
17
AC 100V ~ 240V
AC 100V ~ 240V power supply.
18
POWER
Switch for turning on/off the device.
19
USB
Universal Serial Bus (USB) ports for additional devices such as USB
Hard Disk Drive (HDD).