The D Series D3100 by XS Power is a 12 volt, Group 31 high-output AGM car audio with a maximum current capacity of 5,000A. Cold cranking amps are rated at 1225CCA. Amp hour rating is 110Ah and the reserve capacity is 237min. Wattage output as the primary source is 4,000W. Wattage output as the secondary source is 5,000W. This polarity orientation is L/R. Description of R4G5-BLUE:Please note that Audiosavings audio engineers have tested this wire against 10 other brand names. We did all this research after getting complaints about certain other wires we used to carry. Many other brands did not measure to 4 gauge like our Rockville wire.