This QuickCar Gauge is a Volt Meter unit from the Extreme Gauge Series and features the QuickCar Logo. Gauge also has a built-in 10 Volt Warning sensor that changes the LED back light from white to Amber when the battery voltage drops to 10 Volts or lower. A 12 or 16 Volt power source is required to power gauge. Display has an 8-18 Volt Range and face is a 2-5/8" Diameter. Sold each.