Speco Technologies DVR-T4IP - Manual (Page 101)

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Watermark viewing screen. If you find other color except black, white, blue color, image
file must get damaged.
4.4.10 Panorama
You can see the panorama screen when you push this button while file playing.
(Button will change into like this button. . And & button can help user
to view screen while control screen back and forth. And click the one screen which is one of
the 16 channel, you can see 640x480 image. If you want to come out of the panorama mode,
click button. Then program will go back to former state.