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Depends on the version of the Mount.
If it is a Temma 2M it will use a 12v source and the High and Low speed slewing is internally controlled. But they do not take a 24v source !!
Older EM400 used external 24v for the higher slew rate.
Also in-case you are looking at an older EM400 the Polar Scope will be out of date and you may want to up-date it.
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