DVR systems NVR38xx Series - Manual (Page 18)

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Reverse/Pause  
In normal playback or pause mode, click this button to reverse
playback
In reverse playback, click this button to pause playback.
Play/Pause 
In normal playback click this button to pause playback
In pause mode, click this button to resume playback.
Window switch Mult Click it to switch one-window/multiple-window.
Shuttle(outer
ring)
In real-time monitor mode it works as left/right direction key.
Playback mode, counter clockwise to forward and clock wise to
backward.
Jog(inner dial)
Up/down direction key.
Playback mode, turn the inner dial to realized frame by frame
playback. (Only applies to some special versions.)
USB port To connect USB storage device, USB mouse.
Remote control
indication light
ACT Remote control indication light
Status indication
light
Status If there is Fn indication light, current status indication light is null.
Power indication
light
PWR Power indication light
Record light 1-16 For 4/8/16 ch series ,it becomes on when system is recording.
IR Receiver IR It is to receive the signal from the remote control.