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Hello, is this unit has the option of a 9-volt battery and option for the plug?
Yes, this unit has the option of 9V battery and option of 12VDC plug, can by 12VDC plug, or 9V battery for power supply. The 9V battery power will be automatically disconnected when the 12VDC plug is inserted. The 9V battery will be powered when the 12VDC plug is unplugged.
I just received a new one and the ground seems to keep needing to be reset. Any solutions before I give up and return it?
All need to do is tap the ground wire to the ground.