Power Input for 811-301 Display?

Can anyone tell me what is the power input voltage for the model 811-301 display?

This is one of the(somewhat)inexpensive units used to display the outputs from cheap scales mounted on the X, Y, and Z axes.

The specification sheets I can find on-line only show 110-120V AC input to the power converter. What I need is the DC voltage input into the connector on the side of the display.

Thanks,
Jim Seargeant