From my search results, the model number is Terk VS-4. You can view the user manual by clicking here
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More information is given below:
This unit allows you to feed up to 4 stereo audio and
video sources to one unit (normally one television which has A/V inputs).
It also allows you to connect a second device
such as a portable recorder or amplified loudspeakers to the front AUDIO only
output (stereo minijack).
The two outputs are always live.
There are four switches on the top of the
unit which allow you to select which of the four inputs you want to use.
Since this is a passive device (no AC or
batteries) the input which you select is indicated by a red mark (non-illuminated) which
appears when you select the input.
This unit is a perfect solution if you have
a receiver or amplifier with no video switching or without enough video switching
(or with no S-video capability).
...Placing the unit directly on top of a TV could cause
electromagnetic interference. If this occurs simply move the cables and/or the
switch box .
S-video signals will only be
output when a corresponding S-video signal is connected to the input. For example, if you
connect a standard VHS VCR to input 1 using composite video, only composite video (not S-video) will be output from Output #1.
Only output #1 should be used for dubbing or
editing, since recording levels will drop if you use both Output #1 and Output #2