This is just a voltmeter By William
It is not a power on/off switch. The on/off function only controls the voltmeter display. So hook this across your power source. If you want to control power then you need something else.
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Strange behavior monitoring a solar panel By Guest
Installed on 12 volt (nominal) solar panel monitoring box. Since no-load solar may be 22 volts or so, it seems that in my "12V" solar installation this DMM overloads at times. So the display is erratic, some extra LED turns on, and measurement bounces from 22.x Volts to 14.5V or so. I don't know if it is defective or just cannot handle open circuit solar panel voltages without overloading.
The display is a very attractive, bright blue color.
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