Round Voltage Meter 5V-15VDC with Rainbow DialThis digital dual-round volt meter displays voltage for the main and auxiliary batteries simultaneously. With the same compact size as a standard 12V receptacle socket, this volt meter supports many installation options. Features:Constructed of injection-molded nylonRed LED displayIP65 ratingSpecifications:Input: 10-48VDC.Diameter: 1-7/16 in.Length: 1-3/8 in.Height: 1-1/8 in.Volts: 10-48Weight: 0.04 lb.