Specifications: 1) Extreme Low E.S.R.: less than 0.002 ohm 2) Auto on/off four-digit display 3) LED indicator lights 4) Electronic polarity protection circuit 5) Over-voltage protection circuit 6) Normal working temperature: minus 40 degrees to 95 degrees 7) Installation hardware included Features: 1) Super complement ability for audiophile system 2) Compact design for more systems 3) Wonderful & stable performance with Hi security 4) Super Easy of installation 5) Unique Oval digit display with multi-color available (red, blue & white) 6) Super bright neon light for system upgrading with multi-color available (blue, white & pink)