Stinger SVMB 3-Digit Blue LED Voltage Display
• Displays car audio system's voltage levels;• 3-digit display;• Auto on/off;• Easy 2-connection hookup;• Flush or surface mountable;• Above 15.9 volts will display as "H" (for high) on the display;• Dimensions: 2 in. x 1-1/2 in.;