Mine is a xantrex.
They're pretty simple and all brands are about the same.
If they don't have a digital display they are a series off three button pushes, wait for three flashes, push another two times yadda yadda.
I think it was $128.
Many of them:
Come on at a preset time
Won't come on at a preset time frame
Come on if your batteires are low
Come on preset any day of the week for any preset time to exercise itself.
COME ON AND ACTIVATES YOUR ROOF AC BASED ON YOUR THERMOSTAT SETTING.(pet people love this feature)
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