ALINCO DI-830M. - Brand: ALINCO - Model: DI-830M - Voltage: 24V-13.8V - Function: Switching DC Voltmeter - Fan: Equipped with a cooling fan - Connection Terminals: Multiple connection terminals Thank you for viewing. As is condition. Please check the photos as there is considerable dirt. I have confirmed that the power turns on and the cigarette lighter socket works. I used it in a 24V truck, so I have attached a power switch in the middle of the power cord. The red-painted side of the outlet is positive. This is an old item, so please understand that it is non-refundable and non-returnable.