Sea-Dog Round Voltage Meter DC - 5V-15V w/Rainbow Dial. Red/orange means the voltage is too low. Green means voltage is normal. The same compact round size as a standard 12V receptacle this voltmeter supports many installation options. Constructed of injection molded nylon. Rainbow LED display. For use with 12V systems. Specifications for Sea-Dog Round Voltage Meter DC: Manufacturer: Sea-Dog Color: Black Voltage: 5 volts Charger Type: DC Features of Sea-Dog Round Voltage Meter DC Injection Molded Nylon Quick and easy installation Color coded voltage information Rainbow LED display For use with 12V systems Package Contents: Sea-Dog Round Voltage Meter DC Sea-Dog 421617-1: Round Voltage Meter DC - 5V-15V w/Rainbow Dial